EP3587626B1 - Decorative part made by incrustation - Google Patents

Decorative part made by incrustation Download PDF

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Publication number
EP3587626B1
EP3587626B1 EP18180563.1A EP18180563A EP3587626B1 EP 3587626 B1 EP3587626 B1 EP 3587626B1 EP 18180563 A EP18180563 A EP 18180563A EP 3587626 B1 EP3587626 B1 EP 3587626B1
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EP
European Patent Office
Prior art keywords
support
hollow
aesthetic element
visible
inlaying
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.)
Active
Application number
EP18180563.1A
Other languages
German (de)
French (fr)
Other versions
EP3587626A1 (en
Inventor
Johan ROMAND
Damien LE BOUDOUIL
Nicolas Aubry
Pierry Vuille
Alexandre Netuschill
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.)
Comadur SA
Original Assignee
Comadur 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 Comadur SA filed Critical Comadur SA
Priority to EP18180563.1A priority Critical patent/EP3587626B1/en
Priority to PCT/EP2019/066956 priority patent/WO2020002402A1/en
Priority to JP2020564933A priority patent/JP6980933B2/en
Priority to CN201980038134.3A priority patent/CN112236549B/en
Priority to US17/056,262 priority patent/US20210240138A1/en
Priority to KR1020207034176A priority patent/KR102491225B1/en
Publication of EP3587626A1 publication Critical patent/EP3587626A1/en
Application granted granted Critical
Publication of EP3587626B1 publication Critical patent/EP3587626B1/en
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Anticipated expiration legal-status Critical

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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
    • G04B45/00—Time pieces of which the indicating means or cases provoke special effects, e.g. aesthetic effects
    • G04B45/0076—Decoration of the case and of parts thereof, e.g. as a method of manufacture thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • 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
    • G04B19/18—Graduations on the crystal or glass, on the bezel, or on the rim
    • 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
    • G04B37/226—Non-metallic cases coated with a metallic layer
    • 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
    • A44C27/005—Coating layers for jewellery
    • A44C27/007—Non-metallic coatings

Definitions

  • the present invention relates to a process for manufacturing a decorative piece comprising a step of inlaying by hot pressing a crystalline metal alloy in a support, in particular ceramic, and to the decorative piece resulting from the process.
  • Another process described in the document EP 2 315 673 consists of inlaying the aesthetic elements by pressing into the recesses made in the support.
  • This document describes more particularly a method of inlaying by hot pressing an aesthetic element made of amorphous metallic material within a ceramic support to form, for example, indices on a watch bezel.
  • the use of an amorphous metal for the inlay makes it possible to work under low stresses and temperatures without the risk of weakening the material of the support.
  • the lack of contrast between the amorphous metal and the ceramic support does not allow an optimal visual rendering to be obtained.
  • the method of manufacturing a decorative piece by inlaying an amorphous metal is relatively expensive because it requires adequate treatment to maintain the amorphous structure of the metal.
  • CH699993A2 is another relevant prior art document.
  • the present invention aims to provide a method of manufacturing a decorative piece comprising a step of inlaying by pressing a crystalline metal alloy in one or more hollows made in a support which is in particular made of ceramic.
  • the inlay of a crystalline metal aims to increase the contrast between the aesthetic element and its support and to reduce manufacturing costs.
  • the choice of the crystalline metal relates to an aluminum alloy which has the particular advantage of being deformable at low temperature compared to other crystalline metal alloys. The method according to the invention thus makes it possible to produce a decorative part comprising one or more aesthetic elements in aluminum, which is difficult to achieve with other methods, whether by PVD deposition or by electroforming.
  • the manufacturing process comprises, following the inlaying step and a possible mechanical grinding step, an electrochemical treatment aimed at modifying the surface condition of the inlaid aesthetic elements for the purpose of protection and/or aesthetic purposes.
  • This treatment may consist of selective anodization of said elements with or without coloring.
  • the support, in particular ceramic is not an electrical conductor, one or more of the recesses open out onto one face of the decorative part intended to be not visible in use.
  • These recesses communicating with the non-visible face form as many contact points making it possible to bring the current to the aesthetic elements to be treated electrochemically. Thanks to these non-visible contact points, it is possible to bring current to fine and numerous decorations such as to a tachymeter scale of a watch bezel.
  • a wide color palette and even color gradients can be achieved on these sets. It is also possible to encrust an aluminum alloy at a lower cost and then make it hard by anodizing. This electrochemical treatment is carried out on the inlaid decorations in their final surface condition: polished, satin-brushed, sandblasted and therefore at the end of the manufacturing process.
  • the present invention relates to a process for manufacturing a decorative piece by hot pressing, also called by inlaying, of one or more aesthetic elements in a support provided with one or more recesses and to the decorative piece resulting from the process.
  • the part can in particular be a horological exterior component such as a bezel, a dial, a case, a crown, a pusher, a crystal, a bracelet element, etc.
  • part 1 is a watch bezel comprising an annular body forming the support 2 provided with recesses 4 made in said support 2 to receive the aesthetic elements 3 forming the indices.
  • the aesthetic element is made of a crystalline metal alloy and more precisely of a crystalline aluminum alloy.
  • the support is itself preferably made of a material that is not very ductile. It may, for example, be a ceramic, sapphire, enamel, etc. Preferably, it is a ceramic and, more preferably, a zirconia.
  • the piece may consist of a zirconia watch bezel with indices made of an aluminum alloy. In particular, it may be the 7075 alloy which comprises zinc up to ⁇ 6% by weight.
  • the aluminum alloy has the advantage of being malleable at low temperature due to its low melting point of around 650°C.
  • the support 2 comprises at least one recess 4 made by laser engraving, by machining, etc.
  • the recess 4 has on the surface 2a of the support 2 intended to be visible a shape 4a corresponding to the outline of the desired decoration.
  • This hollow 4 can be blind ( figure 2 ) or lead to a non-visible face 2b of the support 2 ( figure 10 ).
  • the entire volume of the recess 4 is filled with the aesthetic element 3 protruding from or flush with the surface 2a of the support 2.
  • the aesthetic element it is also possible for the aesthetic element to only partially fill the volume of the recess.
  • the recess 4 has flanks 7 with a suitable geometry for optimal retention of the aesthetic element within the recess.
  • the sides 7 can be substantially perpendicular to the visible surface 2a of the support 2 with the aesthetic element held by friction within the recess.
  • the sides are at least partially inclined with a narrowing in the direction of the visible surface preventing the movement of the aesthetic element outside the recess.
  • the sides 7, whether they are inclined or not are pierced with housings 5 which, after filling with the aesthetic element, form a stop which, like the inclined walls, prevents the movement of the aesthetic element.
  • protrusions 6 can be arranged in the recess 4 to provide a similar role of holding means for the aesthetic element.
  • the aesthetic elements are inlaid by hot pressing in the recesses of the support at a temperature between the solidus temperature and the liquidus temperature of the aluminum alloy constituting the aesthetic element typically between 500 ° C and 650°C. More specifically, the inlay steps of the manufacturing process according to the invention are illustrated schematically using the figures 3 to 7 .
  • the support 2 provided with the recess(es) 4 is made available ( fig.3 ).
  • the preform(s) intended to form the aesthetic element(s) 3 are made available.
  • the aesthetic element to be embedded is in the form of an annular preform with a diameter and a ring width of dimensions substantially equivalent to those of the indices.
  • an anti-adherent layer e.g. boron nitride
  • the support is preheated to avoid thermal shock.
  • the preheating temperature is between 300 and 500°C.
  • the preform 3 is placed on the surface 2a of the support 2 at the level of the hollow 4 ( fig.4 ).
  • the assembly is placed in a press where the preform is heated to a temperature between the solidus and the liquidus of the material constituting the preform, which makes it possible to soften the material before carrying out the pressing.
  • a pressure P is applied to the preform 3 to fill the recesses 4 with the aluminum alloy ( fig.5 and fig.6 ).
  • the load during embedding is maintained at a value of less than 1000 kg to avoid damaging the support. This load is advantageously between 500 and 800 kg.
  • This pressing cycle can be carried out in several stages with a preload stage before increasing the pressure to the desired maximum pressure.
  • the step of embedding the aluminum alloy in the hollows is then followed by a cooling step and a possible mechanical grinding step such as polishing to remove the surplus of the aesthetic element. 3 ( fig.7 ) and achieve visible surfaces of the support and the aesthetic element connected to each other without solution of continuity.
  • the aesthetic element is subjected to a finishing treatment.
  • This treatment can consist of a selective electrochemical treatment of the encrusted metallic material, and more precisely, of anodization with or without coloring to modify the appearance and/or the hardness of the encrusted material.
  • the supports targeted by the present invention being mainly electrically non-conductive, the difficulty lies in the routing of the current to the aesthetic elements during the electrochemical treatment and, this, via contact points which must imperatively be not visible on the decorative piece. .
  • one or more of the recesses are configured to open out onto a face intended to be invisible from the decorative part. These hollows opening onto the non-visible face form as many contact points making it possible to bring the current to the inlaid aesthetic elements.
  • the recess 4 for each of the indices opens onto the rear face 2b of the bezel 1 as illustrated in figure 10 .
  • the contact points 4b make it possible to bring the current to each of the indicia during the electrochemical treatment.
  • These contact points 4b on the rear face 2b of the support 2 may have a section which is less than that of the part 4a of the recess opening onto the visible face 2a of the support 2.
  • These contact points make it possible to carry out the same electrochemical treatment for each index or possibly to combine different treatments and therefore colors by bringing the current to only one or more of the indices for each electrochemical treatment.
  • the aesthetic element 3 is larger in size, as in the examples of figure 11A And 12B , several contact points per aesthetic element may be required to ensure uniform electrochemical treatment of the aesthetic element.
  • three aesthetic elements 3 are distributed over an annular portion of the visible face 2a of the bezel 1.
  • the aesthetic elements 3 are inlaid on the substrate 2 including the indicia made of a non-conductive material .
  • the bezel 1 is provided with several orifices 4b communicating with the recesses 4 to produce the contact points allowing the current to be brought to these three elements.
  • two contact points 4b are provided per aesthetic element 3.
  • the figures 12B and 12C represent another configuration of an aesthetic element inlaid in aluminum in a hollow formed in a support.
  • the aesthetic element 3 extends as far as a horn 8a of the middle part of the watch case 8 and comprises housings 3a for setting stones 9.
  • the recess receiving the aesthetic element opens at least in one place on a non-visible face of the watch case. It is thus conceivable that the recess 4 communicates with the bar hole 10 as illustrated in the Figure 12A .
  • the hollow 4 can communicate in several places by other openings allowing contact points to be made bringing the current to the aesthetic element 3
  • the present invention thus makes it possible, thanks to the electrical contact point(s) provided (s) on a non-visible face of the watch case to electrochemically treat the aesthetic element after crimping with the stones.
  • the present invention has been more specifically illustrated for a decorative part in watchmaking, but it goes without saying that the method according to the invention applies to the production of decorative parts in many other fields such as jewelry, telephony, automobiles, etc.

Description

DOMAINE TECHNIQUETECHNICAL AREA

La présente invention se rapporte à un procédé de fabrication d'une pièce décorative comprenant une étape d'incrustation par pressage à chaud d'un alliage cristallin métallique dans un support notamment en céramique et à la pièce décorative issue du procédé.The present invention relates to a process for manufacturing a decorative piece comprising a step of inlaying by hot pressing a crystalline metal alloy in a support, in particular ceramic, and to the decorative piece resulting from the process.

ART ANTERIEURPRIOR ART

Il est connu de décorer des composants d'habillage en horlogerie avec des éléments esthétiques. Il existe, par exemple, des lunettes de montre décorées de motifs tels que des indices. Ces lunettes, généralement en céramique, peuvent être marquées de différentes façons et par différents matériaux tels que de l'or, de l'argent ou du platine. Ledit marquage peut être réalisé en relief ou en profondeur. Dans le cas d'un marquage en profondeur, celui-ci est réalisé par remplissage de creusures préalablement usinées dans le support. Le principe utilisé pour la réalisation de ce marquage consiste à déposer une couche d'accrochage conductrice par dépôt physique en phase vapeur (PVD). Une fois la couche d'accrochage déposée, les creusures sont remplies du métal par électroformage. Ce procédé présente pour désavantages d'être complexe et extrêmement lent.It is known to decorate exterior components in watchmaking with aesthetic elements. There are, for example, watch bezels decorated with patterns such as indices. These glasses, generally made of ceramic, can be marked in different ways and by different materials such as gold, silver or platinum. Said marking can be made in relief or in depth. In the case of in-depth marking, this is carried out by filling in hollows machined beforehand in the support. The principle used to produce this marking consists in depositing a conductive bonding layer by physical vapor deposition (PVD). Once the bonding layer has been deposited, the hollows are filled with the metal by electroforming. This method has the disadvantages of being complex and extremely slow.

Un autre procédé décrit dans le document EP 2 315 673 consiste à incruster par pressage les éléments esthétiques dans des creusures ménagées dans le support. Ce document décrit plus particulièrement un procédé d'incrustation par pressage à chaud d'un élément esthétique réalisé dans matériau métallique amorphe au sein d'un support céramique pour former, par exemple, des indices sur une lunette de montre. L'utilisation d'un métal amorphe pour l'incrustation permet de travailler sous faibles contraintes et températures sans risque de fragiliser le matériau du support. Cependant, le manque de contraste entre le métal amorphe et le support céramique ne permet pas d'obtenir un rendu visuel optimal. Par ailleurs, le procédé de fabrication d'une pièce décorative par incrustation d'un métal amorphe est relativement coûteux car il nécessite un traitement adéquat pour maintenir la structure amorphe du métal. CH699993A2 constitue un autre document pertinent de l'état de la technique.Another process described in the document EP 2 315 673 consists of inlaying the aesthetic elements by pressing into the recesses made in the support. This document describes more particularly a method of inlaying by hot pressing an aesthetic element made of amorphous metallic material within a ceramic support to form, for example, indices on a watch bezel. The use of an amorphous metal for the inlay makes it possible to work under low stresses and temperatures without the risk of weakening the material of the support. However, the lack of contrast between the amorphous metal and the ceramic support does not allow an optimal visual rendering to be obtained. Furthermore, the method of manufacturing a decorative piece by inlaying an amorphous metal is relatively expensive because it requires adequate treatment to maintain the amorphous structure of the metal. CH699993A2 is another relevant prior art document.

RESUME DE L'INVENTIONSUMMARY OF THE INVENTION

Pour pallier les désavantages précités, la présente invention a pour objet de proposer un procédé de fabrication d'une pièce décorative comprenant une étape d'incrustation par pressage d'un alliage métallique cristallin dans une ou plusieurs creusures ménagées dans un support qui est notamment en céramique. L'incrustation d'un métal cristallin vise à augmenter le contraste entre l'élément esthétique et son support et à réduire les coûts de fabrication. Selon l'invention, le choix du métal cristallin se porte sur un alliage d'aluminium qui présente notamment pour avantage d'être déformable à basse température par rapport à d'autres alliages métalliques cristallins. Le procédé selon l'invention permet ainsi de réaliser une pièce décorative comprenant un ou plusieurs éléments esthétiques en aluminium, ce qui est difficilement réalisable avec d'autres procédés, que ce soit par dépôt PVD ou par électroformage.To overcome the aforementioned disadvantages, the present invention aims to provide a method of manufacturing a decorative piece comprising a step of inlaying by pressing a crystalline metal alloy in one or more hollows made in a support which is in particular made of ceramic. The inlay of a crystalline metal aims to increase the contrast between the aesthetic element and its support and to reduce manufacturing costs. According to the invention, the choice of the crystalline metal relates to an aluminum alloy which has the particular advantage of being deformable at low temperature compared to other crystalline metal alloys. The method according to the invention thus makes it possible to produce a decorative part comprising one or more aesthetic elements in aluminum, which is difficult to achieve with other methods, whether by PVD deposition or by electroforming.

Avantageusement, le procédé de fabrication comprend à la suite de l'étape d'incrustation et d'une éventuelle étape de rectification mécanique un traitement électrochimique visant à modifier l'état de surface des éléments esthétiques incrustés à des fins de protection et/ou à des fins esthétiques. Ce traitement peut consister en une anodisation sélective desdits éléments avec ou sans coloration. Le support, notamment en céramique, n'étant pas un conducteur électrique, une ou plusieurs des creusures débouchent sur une face de la pièce décorative destinée à être non visible en utilisation. Ces creusures communiquant avec la face non visible forment autant de points de contact permettant d'amener le courant sur les éléments esthétiques à traiter par voie électrochimique. Grâce à ces points de contact non visibles, il est possible d'apporter du courant sur des décors fins et nombreux comme sur une échelle tachymétrique d'une lunette de montre. Une large palette de couleurs et même des dégradés de couleurs peuvent être obtenus sur ces décors. Il est également envisageable d'incruster un alliage d'aluminium à moindre coût et de le rendre ensuite dur par anodisation. Ce traitement par voie électrochimique est réalisé sur les décors incrustés dans leur état de surface final : poli, satiné, sablé et donc en fin de procédé de fabrication.Advantageously, the manufacturing process comprises, following the inlaying step and a possible mechanical grinding step, an electrochemical treatment aimed at modifying the surface condition of the inlaid aesthetic elements for the purpose of protection and/or aesthetic purposes. This treatment may consist of selective anodization of said elements with or without coloring. Since the support, in particular ceramic, is not an electrical conductor, one or more of the recesses open out onto one face of the decorative part intended to be not visible in use. These recesses communicating with the non-visible face form as many contact points making it possible to bring the current to the aesthetic elements to be treated electrochemically. Thanks to these non-visible contact points, it is possible to bring current to fine and numerous decorations such as to a tachymeter scale of a watch bezel. A wide color palette and even color gradients can be achieved on these sets. It is also possible to encrust an aluminum alloy at a lower cost and then make it hard by anodizing. This electrochemical treatment is carried out on the inlaid decorations in their final surface condition: polished, satin-brushed, sandblasted and therefore at the end of the manufacturing process.

D'autres caractéristiques et avantages de la présente invention apparaîtront dans la description suivante de modes de réalisation préférés, présentés à titre d'exemple non limitatif en référence aux dessins annexés.Other characteristics and advantages of the present invention will appear in the following description of preferred embodiments, presented by way of non-limiting example with reference to the appended drawings.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF FIGURES

  • La figure 1 représente une vue en plan d'une pièce décorative et, en particulier, d'une lunette de montre comportant des indices en alliage d'aluminium réalisés par incrustation avec le procédé selon l'invention.There figure 1 shows a plan view of a decorative part and, in particular, of a watch bezel comprising indices in aluminum alloy produced by inlaying with the method according to the invention.
  • La figure 2 représente une vue partielle en coupe de cette même pièce décorative.There picture 2 represents a partial sectional view of this same decorative piece.
  • Les figures 3 à 7 représentent schématiquement les étapes d'incrustation de la préforme en alliage d'aluminium dans le support avec le procédé selon l'invention.THE figures 3 to 7 schematically represent the steps of embedding the aluminum alloy preform in the support with the method according to the invention.
  • Les figures 8 et 9 représentent respectivement deux variantes des moyens mis en oeuvre selon l'invention pour maintenir l'élément esthétique au sein de la creusure.THE figures 8 and 9 respectively represent two variants of the means implemented according to the invention to maintain the aesthetic element within the recess.
  • La figure 10 représente une variante de la figure 2 avec les creusures débouchant sur la face arrière, c'est-à-dire la face non visible, de la lunette.There figure 10 represents a variant of figure 2 with the recesses opening onto the rear face, that is to say the non-visible face, of the bezel.
  • La figure 11A représente une vue de la face avant, c'est-à-dire de la face visible, de la lunette incrustée avec plusieurs éléments esthétiques, ainsi qu'une vue en coupe partielle de la lunette, focalisée sur un élément esthétique. La figure 11B représente une vue de la face arrière de cette même lunette.There figure 11A represents a view of the front side, that is to say the visible side, of the bezel inlaid with several aesthetic elements, as well as a partial sectional view of the bezel, focused on an aesthetic element. There figure 11B represents a view of the rear face of this same bezel.
  • La figure 12A représente une vue tridimensionnelle d'une boîte de montre comprenant sur la carrure une creusure communiquant avec le trou de barrette. La figure 12B représente cette même boîte de montre comprenant un élément esthétique incrusté dans la creusure. La figure 12C représente cette même boîte de montre comprenant l'élément esthétique incrusté dans la creusure et serti avec des pierres.There Figure 12A represents a three-dimensional view of a watch case comprising a recess on the middle part communicating with the bar hole. There figure 12B represents this same watch case comprising an aesthetic element embedded in the hollow. There figure 12C represents this same watch case including the aesthetic element encrusted in the hollow and set with stones.
DESCRIPTION DETAILLEEDETAILED DESCRIPTION

La présente invention se rapporte à un procédé de fabrication d'une pièce décorative par pressage à chaud, aussi dit par incrustation, d'un ou plusieurs éléments esthétiques dans un support muni d'une ou plusieurs creusures et à la pièce décorative issue du procédé. La pièce peut notamment être un composant d'habillage en horlogerie tel qu'une lunette, un cadran, une boîte, une couronne, un poussoir, une glace, un élément de bracelet, etc. A titre d'exemple illustré aux figures 1 et 2, la pièce 1 est une lunette de montre comprenant un corps annulaire formant le support 2 muni de creusures 4 ménagées dans ledit support 2 pour recevoir les éléments esthétiques 3 formant les indices.The present invention relates to a process for manufacturing a decorative piece by hot pressing, also called by inlaying, of one or more aesthetic elements in a support provided with one or more recesses and to the decorative piece resulting from the process. . The part can in particular be a horological exterior component such as a bezel, a dial, a case, a crown, a pusher, a crystal, a bracelet element, etc. As an example illustrated in figures 1 and 2 , part 1 is a watch bezel comprising an annular body forming the support 2 provided with recesses 4 made in said support 2 to receive the aesthetic elements 3 forming the indices.

Selon l'invention, l'élément esthétique est réalisé dans un alliage métallique cristallin et plus précisément dans un alliage cristallin d'aluminium. Le support est quant à lui préférentiellement réalisé dans un matériau peu ductile. Il peut, par exemple, s'agir d'une céramique, du saphir, de l'émail, etc. De préférence, il s'agit d'une céramique et, plus préférentiellement, d'une zircone. Ainsi, la pièce peut consister en une lunette de montre en zircone avec des indices réalisés dans un alliage d'aluminium. En particulier, il peut s'agir de l'alliage 7075 qui comprend du zinc à hauteur de ∼ 6% en poids. L'alliage d'aluminium a pour avantage d'être malléable à faible température de par sa température de fusion peu élevée de l'ordre de 650°C.According to the invention, the aesthetic element is made of a crystalline metal alloy and more precisely of a crystalline aluminum alloy. The support is itself preferably made of a material that is not very ductile. It may, for example, be a ceramic, sapphire, enamel, etc. Preferably, it is a ceramic and, more preferably, a zirconia. Thus, the piece may consist of a zirconia watch bezel with indices made of an aluminum alloy. In particular, it may be the 7075 alloy which comprises zinc up to ∼ 6% by weight. The aluminum alloy has the advantage of being malleable at low temperature due to its low melting point of around 650°C.

Le support 2 comporte au moins une creusure 4 réalisée par gravage laser, par usinage, etc. La creusure 4 présente sur la surface 2a du support 2 destinée à être visible une forme 4a correspondant au contour du décor souhaité. Cette creusure 4 peut être borgne (figure 2) ou déboucher sur une face non visible 2b du support 2 (figure 10). Avantageusement, tout le volume de la creusure 4 est rempli avec l'élément esthétique 3 faisant saillie ou affleurant à la surface 2a du support 2. En variante, il est également envisageable que l'élément esthétique remplisse seulement partiellement le volume de la creusure. La creusure 4 possède des flancs 7 avec une géométrie adaptée pour un maintien optimal de l'élément esthétique au sein de la creusure. Comme schématisé à la figure 3, les flancs 7 peuvent être sensiblement perpendiculaires à la surface visible 2a du support 2 avec l'élément esthétique maintenu par frottement au sein de la creusure. Selon une variante préférée non représentée, les flancs sont au moins partiellement inclinés avec un rétrécissement en direction de la surface visible empêchant le déplacement de l'élément esthétique en dehors de la creusure. Selon une autre variante préférée représentée à la figure 8, les flancs 7, qu'ils soient inclinés ou non, sont percés de logements 5 qui, après remplissage avec l'élément esthétique, forment une butée qui au même titre que les parois inclinées empêchent le déplacement de l'élément esthétique. Selon une autre variante préférée représentée à la figure 9, des excroissances 6 peuvent être agencées dans la creusure 4 pour assurer un rôle similaire de moyen de maintien de l'élément esthétique.The support 2 comprises at least one recess 4 made by laser engraving, by machining, etc. The recess 4 has on the surface 2a of the support 2 intended to be visible a shape 4a corresponding to the outline of the desired decoration. This hollow 4 can be blind ( figure 2 ) or lead to a non-visible face 2b of the support 2 ( figure 10 ). Advantageously, the entire volume of the recess 4 is filled with the aesthetic element 3 protruding from or flush with the surface 2a of the support 2. As a variant, it is also possible for the aesthetic element to only partially fill the volume of the recess. The recess 4 has flanks 7 with a suitable geometry for optimal retention of the aesthetic element within the recess. As schematized in picture 3 , the sides 7 can be substantially perpendicular to the visible surface 2a of the support 2 with the aesthetic element held by friction within the recess. According to a preferred variant, not shown, the sides are at least partially inclined with a narrowing in the direction of the visible surface preventing the movement of the aesthetic element outside the recess. According to another preferred variant shown in figure 8 , the sides 7, whether they are inclined or not, are pierced with housings 5 which, after filling with the aesthetic element, form a stop which, like the inclined walls, prevents the movement of the aesthetic element. According to another preferred variant shown in figure 9 , protrusions 6 can be arranged in the recess 4 to provide a similar role of holding means for the aesthetic element.

Selon l'invention, les éléments esthétiques sont incrustés par pressage à chaud dans les creusures du support à une température comprise entre la température de solidus et la température de liquidus de l'alliage d'aluminium constituant l'élément esthétique typiquement entre 500°C et 650°C. Plus précisément, les étapes d'incrustation du procédé de fabrication selon l'invention sont illustrées schématiquement à l'aide des figures 3 à 7. Tout d'abord, le support 2 muni de la ou des creusures 4 est mis à disposition (fig.3). De même, la ou les préformes destinées à former le ou les éléments esthétiques 3 sont mises à disposition. Dans le cas d'une lunette de montre à décorer avec des indices en aluminium, l'élément esthétique à incruster se présente sous forme d'une préforme annulaire avec un diamètre et une largeur d'anneau de dimensions sensiblement équivalentes à celles des indices. Pour éviter que la préforme ne colle à la presse lors de l'incrustation, une couche anti-adhérente, par ex. en nitrure de bore, peut être appliquée sur la face destinée à être en contact avec la presse. Dans une première étape, le support est préchauffé pour éviter un choc thermique. Préférentiellement, la température de préchauffage est comprise entre 300 et 500°C. Ensuite, la préforme 3 est placée sur la surface 2a du support 2 au niveau de la creusure 4 (fig.4). L'ensemble est placé dans une presse où la préforme est chauffée à une température comprise entre le solidus et le liquidus du matériau constituant la préforme, ce qui permet de ramollir le matériau avant d'effectuer le pressage. Ensuite, une pression P est appliquée sur la préforme 3 pour remplir les creusures 4 avec l'alliage d'aluminium (fig.5 et fig.6). Préférentiellement, la charge lors de l'incrustation est maintenue à une valeur inférieure à 1000 kg pour éviter d'endommager le support. Cette charge est avantageusement comprise entre 500 et 800 kg. Ce cycle de pressage peut être réalisé en plusieurs étapes avec une étape de précharge avant d'augmenter la pression jusqu'à la pression maximum souhaitée. L'étape d'incrustation de l'alliage d'aluminium dans les creusures est ensuite suivie d'une étape de refroidissement et d'une éventuelle étape de rectification mécanique telle qu'un polissage permettant d'enlever le surplus de l'élément esthétique 3 (fig.7) et réaliser surfaces apparentes du support et de l'élément esthétique reliées l'une à l'autre sans solution de continuité.According to the invention, the aesthetic elements are inlaid by hot pressing in the recesses of the support at a temperature between the solidus temperature and the liquidus temperature of the aluminum alloy constituting the aesthetic element typically between 500 ° C and 650°C. More specifically, the inlay steps of the manufacturing process according to the invention are illustrated schematically using the figures 3 to 7 . First of all, the support 2 provided with the recess(es) 4 is made available ( fig.3 ). Similarly, the preform(s) intended to form the aesthetic element(s) 3 are made available. In the case of a watch bezel to be decorated with aluminum indices, the aesthetic element to be embedded is in the form of an annular preform with a diameter and a ring width of dimensions substantially equivalent to those of the indices. To prevent the preform from sticking to the press during embedding, an anti-adherent layer, e.g. boron nitride, can be applied to the side intended to be in contact with the press. In a first step, the support is preheated to avoid thermal shock. Preferably, the preheating temperature is between 300 and 500°C. Then, the preform 3 is placed on the surface 2a of the support 2 at the level of the hollow 4 ( fig.4 ). The assembly is placed in a press where the preform is heated to a temperature between the solidus and the liquidus of the material constituting the preform, which makes it possible to soften the material before carrying out the pressing. Then, a pressure P is applied to the preform 3 to fill the recesses 4 with the aluminum alloy ( fig.5 and fig.6 ). Preferably, the load during embedding is maintained at a value of less than 1000 kg to avoid damaging the support. This load is advantageously between 500 and 800 kg. This pressing cycle can be carried out in several stages with a preload stage before increasing the pressure to the desired maximum pressure. The step of embedding the aluminum alloy in the hollows is then followed by a cooling step and a possible mechanical grinding step such as polishing to remove the surplus of the aesthetic element. 3 ( fig.7 ) and achieve visible surfaces of the support and the aesthetic element connected to each other without solution of continuity.

A titre d'exemple, dans le cas d'une incrustation de l'alliage métallique d'aluminium 7075 dans un support à base de zircone. Le support a été préchauffé à 450°C, la préforme a été chauffée à 550°C pendant 90 secondes et pressée sous une charge de l'ordre de 750 kg.By way of example, in the case of an inlay of the metallic aluminum alloy 7075 in a support based on zirconia. The support was preheated to 450° C., the preform was heated to 550° C. for 90 seconds and pressed under a load of the order of 750 kg.

Avantageusement, après l'étape de rectification mécanique, l'élément esthétique est soumis à un traitement de finition. Ce traitement peut consister en un traitement électrochimique sélectif de la matière métallique incrustée, et plus précisément, en une anodisation avec ou sans coloration pour modifier l'apparence et/ou la dureté de la matière incrustée. Les supports visés par la présente invention étant majoritairement électriquement non conducteurs, la difficulté réside dans l'acheminement du courant jusqu'aux éléments esthétiques lors du traitement électrochimique et, ce, via des points de contact qui doivent impérativement être non visibles sur la pièce décorative. A cet effet, une ou plusieurs des creusures sont configurées pour déboucher sur une face destinée à être non visible de la pièce décorative. Ces creusures débouchant sur la face non visible forment autant de points de contact permettant d'amener le courant sur les éléments esthétiques incrustés. Revenant à l'exemple de la lunette de montre en céramique comprenant des indices réalisés par incrustation d'un alliage cristallin d'aluminium, la creusure 4 pour chacun des indices débouche sur la face arrière 2b de la lunette 1 comme illustré à la figure 10. Les points de contact 4b permettent d'amener le courant sur chacun des indices lors du traitement électrochimique. Ces points de contact 4b sur la face arrière 2b du support 2 peuvent avoir une section qui est moindre que celle de la partie 4a de la creusure débouchant sur la face visible 2a du support 2. Ces points de contact permettent de réaliser un même traitement électrochimique pour chaque indice ou éventuellement de combiner différents traitements et donc couleurs en amenant le courant sur seulement un ou plusieurs des indices pour chaque traitement électrochimique.Advantageously, after the mechanical grinding step, the aesthetic element is subjected to a finishing treatment. This treatment can consist of a selective electrochemical treatment of the encrusted metallic material, and more precisely, of anodization with or without coloring to modify the appearance and/or the hardness of the encrusted material. The supports targeted by the present invention being mainly electrically non-conductive, the difficulty lies in the routing of the current to the aesthetic elements during the electrochemical treatment and, this, via contact points which must imperatively be not visible on the decorative piece. . To this end, one or more of the recesses are configured to open out onto a face intended to be invisible from the decorative part. These hollows opening onto the non-visible face form as many contact points making it possible to bring the current to the inlaid aesthetic elements. Returning to the example of the ceramic watch bezel comprising indices produced by inlaying a crystalline aluminum alloy, the recess 4 for each of the indices opens onto the rear face 2b of the bezel 1 as illustrated in figure 10 . The contact points 4b make it possible to bring the current to each of the indicia during the electrochemical treatment. These contact points 4b on the rear face 2b of the support 2 may have a section which is less than that of the part 4a of the recess opening onto the visible face 2a of the support 2. These contact points make it possible to carry out the same electrochemical treatment for each index or possibly to combine different treatments and therefore colors by bringing the current to only one or more of the indices for each electrochemical treatment.

Si l'élément esthétique 3 est de taille plus importante, comme dans les exemples des figures 11A et 12B, plusieurs points de contact par élément esthétique peuvent être requis pour assurer un traitement électrochimique uniforme de l'élément esthétique. A la figure 11A, à titre d'exemple, trois éléments esthétiques 3 sont répartis sur une portion annulaire de la face visible 2a de la lunette 1. Dans cette configuration, les éléments esthétiques 3 sont incrustés sur le substrat 2 incluant les indices réalisé dans un matériau non conducteur. Sur sa face arrière 2b visible à la figure 11B, la lunette 1 est munie de plusieurs orifices 4b communiquant avec les creusures 4 pour réaliser les points de contact permettant d'amener le courant sur ces trois éléments. Comme représenté à la figure 11A sur la vue en coupe, deux points de contact 4b sont prévus par élément esthétique 3. Les figures 12B et 12C représentent une autre configuration d'un élément esthétique en aluminium incrusté dans une creusure ménagée dans un support. L'élément esthétique 3 s'étend jusqu'à une corne 8a de la carrure de la boîte de montre 8 et comporte des logements 3a pour le sertissage de pierres 9. De manière similaire aux autres exemples, la creusure recevant l'élément esthétique débouche au moins à un endroit sur une face non visible de la boîte de montre. Il est ainsi envisageable que la creusure 4 communique avec le trou de barrette 10 comme illustré à la figure 12A. Bien entendu la creusure 4 peut communiquer en plusieurs endroits par d'autres orifices débouchant permettant de réaliser des points de contact amenant le courant à l'élément esthétique 3 La présente invention permet ainsi grâce au(x) point(s) de contact électrique ménagé(s) sur une face non visible de la boîte de montre de traiter par voie électrochimique l'élément esthétique après sertissage avec les pierres.If the aesthetic element 3 is larger in size, as in the examples of figure 11A And 12B , several contact points per aesthetic element may be required to ensure uniform electrochemical treatment of the aesthetic element. To the figure 11A , by way of example, three aesthetic elements 3 are distributed over an annular portion of the visible face 2a of the bezel 1. In this configuration, the aesthetic elements 3 are inlaid on the substrate 2 including the indicia made of a non-conductive material . On its rear face 2b visible at the figure 11B , the bezel 1 is provided with several orifices 4b communicating with the recesses 4 to produce the contact points allowing the current to be brought to these three elements. As depicted at figure 11A in the sectional view, two contact points 4b are provided per aesthetic element 3. The figures 12B and 12C represent another configuration of an aesthetic element inlaid in aluminum in a hollow formed in a support. The aesthetic element 3 extends as far as a horn 8a of the middle part of the watch case 8 and comprises housings 3a for setting stones 9. In a manner similar to the other examples, the recess receiving the aesthetic element opens at least in one place on a non-visible face of the watch case. It is thus conceivable that the recess 4 communicates with the bar hole 10 as illustrated in the Figure 12A . Of course the hollow 4 can communicate in several places by other openings allowing contact points to be made bringing the current to the aesthetic element 3 The present invention thus makes it possible, thanks to the electrical contact point(s) provided (s) on a non-visible face of the watch case to electrochemically treat the aesthetic element after crimping with the stones.

La présente invention a été plus spécifiquement illustrée pour une pièce décorative en horlogerie mais il va de soi que le procédé selon l'invention s'applique pour la réalisation de pièces décoratives dans de nombreux autres domaines tels que la joaillerie, la téléphonie, l'automobile, etc.The present invention has been more specifically illustrated for a decorative part in watchmaking, but it goes without saying that the method according to the invention applies to the production of decorative parts in many other fields such as jewelry, telephony, automobiles, etc.

Légende des figuresLegend of figures

(1)(1)
Pièce décorativedecorative piece
(2)(2)
Support
a. Face visible
b. Face invisibleSupport
To. face up
b. Invisible face
(3)(3)
Elément esthétique ou préforme
a. LogementAesthetic element or preform
To. Accommodation
(4)(4)
Creusure
a. Partie débouchant sur la face visible du support
b. Partie débouchant sur la face non visible du support, aussi appelée point de contactHollowing
To. Part leading to the visible side of the support
b. Part leading to the non-visible face of the support, also called the point of contact
(5)(5)
Logement dans la creusureHousing in the hollow
(6)(6)
Excroissance dans la creusureGrowth in the hollow
(7)(7)
Flanc de la creusureSide of the hollow
(8)(8)
Boîte de montre
a. Cornewatch box
To. Horn
(9)(9)
PierreRock
(10)(10)
Trou de barrettepin hole

Claims (20)

  1. Method for manufacturing a part (1) comprising a support (2) provided with at least one hollow (4) filled with an aesthetic element (3) forming a decoration on a face (2a) of the part (1) intended to be visible, said method comprising the steps of:
    - Providing the support (2) provided with said at least one hollow (4) and providing a preform intended to form the aesthetic element (3) of the part (1), the hollow opening out in at least one place on a face non-visible of the said aesthetic element,
    - Inlaying by hot pressing the preform into said at least one hollow (4) of the support (2),
    the method being characterized in that the preform is made of a crystalline aluminium alloy, the inlaying step being carried out at a temperature between the solidus temperature and the liquidus temperature of the crystalline aluminium alloy.
  2. Method according to claim 1, characterized in that the support (2) is made of a material chosen from among ceramic, sapphire and enamel.
  3. Method according to claim 1 or 2, characterized in that the support (2) is made of a zirconia-based ceramic.
  4. Method according to any of the preceding claims, characterized in that the crystalline aluminium alloy is the 7075 alloy.
  5. Method according to any of the preceding claims, characterized in that the support (2) is preheated prior to the inlay step to a temperature comprised between 300 and 500°C.
  6. Method according to any of the preceding claims, characterized in that the step of inlaying by hot pressing is carried out under a load of between 500 and 1000 kg.
  7. Method according to any of the preceding claims, characterized in that the step of inlaying by hot pressing is carried out at a temperature comprised between 500 and 650°C.
  8. Method according to any of the preceding claims, characterized in that the method further includes, after the inlaying step, an electrochemical surface treatment step of the aesthetic element (3).
  9. Method according to claim 8, characterized in that said electrochemical surface treatment step is carried out after a mechanical grinding step following the inlaying step.
  10. Method according to claim 8 or 9, characterized in that said at least one hollow (4) opens out at several places on a face (2b) of the part (1) intended to be non-visible, to respectively form one or more contact points (4b) for supplying current across the aesthetic element (3) during the surface treatment.
  11. Part (1) comprising a support (2) provided with at least one hollow (4) filled with an aesthetic element (3) forming a decoration on a visible face (2a) of the part (1), said aesthetic element (3) being made of a crystalline aluminium alloy and the said hollow opening out in at least one place on a face non-visible of the said aesthetic element.
  12. Part (1) according to claim 11, characterized in that the support (2) is made of a material chosen from among ceramic, sapphire and enamel.
  13. Part (1) according to claim 11 or 12, characterized in that the support (2) is made of a zirconia-based ceramic.
  14. Part (1) according to any of claims 11 to 13, characterized in that the crystalline aluminium alloy is the 7075 alloy.
  15. Part (1) according to any of claims 11 to 14, characterized in that said at least one hollow (4) opens in one or more places onto a face (2b) of the part (1) that is intended to be non-visible.
  16. Part (1) according to any of claims 11 to 15, characterized in that the part is an external component for horology or jewellery.
  17. Part (1) according to claim 16, characterized in that the part is a watch bezel forming the support (2) with at least one hollow (4) filled with the crystalline aluminium alloy forming as the aesthetic element (3) an index or an annular portion of the bezel.
  18. Part (1) according to claim 16, characterized in that the part is a case middle forming the support (2) with at least one hollow (4) filled with the crystalline aluminium alloy forming as the aesthetic element (3) a portion of the case middle extending as far as a horn (8a) of the case middle.
  19. Part (1) according to claim 18, characterized in that said at least one hollow (4) communicates with a bar hole (10) arranged in the horn (8a).
  20. Part according to any of claims 11 to 19, characterized in that the aesthetic element (3) comprises an anodized layer.
EP18180563.1A 2018-06-28 2018-06-28 Decorative part made by incrustation Active EP3587626B1 (en)

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EP18180563.1A EP3587626B1 (en) 2018-06-28 2018-06-28 Decorative part made by incrustation
PCT/EP2019/066956 WO2020002402A1 (en) 2018-06-28 2019-06-26 Decorative part produced by inlaying
JP2020564933A JP6980933B2 (en) 2018-06-28 2019-06-26 Decorative parts manufactured by inlaying
CN201980038134.3A CN112236549B (en) 2018-06-28 2019-06-26 Decorative part made by inlaying
US17/056,262 US20210240138A1 (en) 2018-06-28 2019-06-26 Decorative part made by inlaying
KR1020207034176A KR102491225B1 (en) 2018-06-28 2019-06-26 Decorative parts manufactured by inlaying

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CN112236549A (en) 2021-01-15
KR20210005701A (en) 2021-01-14
JP6980933B2 (en) 2021-12-15
CN112236549B (en) 2023-09-29
US20210240138A1 (en) 2021-08-05
KR102491225B1 (en) 2023-01-20
JP2021526206A (en) 2021-09-30
WO2020002402A1 (en) 2020-01-02

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