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EP3814553A1 - Method for producing decorative parts - Google Patents

Method for producing decorative parts

Info

Publication number
EP3814553A1
EP3814553A1 EP19730182.3A EP19730182A EP3814553A1 EP 3814553 A1 EP3814553 A1 EP 3814553A1 EP 19730182 A EP19730182 A EP 19730182A EP 3814553 A1 EP3814553 A1 EP 3814553A1
Authority
EP
European Patent Office
Prior art keywords
aesthetic element
support
recess
piece
aesthetic
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
Application number
EP19730182.3A
Other languages
German (de)
French (fr)
Other versions
EP3814553B1 (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
Publication of EP3814553A1 publication Critical patent/EP3814553A1/en
Application granted granted Critical
Publication of EP3814553B1 publication Critical patent/EP3814553B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/26—Inlaying with ornamental structures, e.g. niello work, tarsia work
    • 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
    • C25D11/022—Anodisation on selected surface areas
    • 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
    • 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
    • C25D11/16—Pretreatment, e.g. desmutting
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/02—Electroplating of selected surface areas
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/005—Jewels; Clockworks; Coins
    • 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

Definitions

  • the present invention relates to a method of manufacturing decorative pieces. It relates more particularly to a method of manufacturing a decorative piece comprising a conductive aesthetic element embedded in a support made of an electrically non-conductive material.
  • the manufacturing process includes, following the inlay step, an electrochemical surface treatment step of the embedded elements.
  • Another method described in document EP 2 315 673 consists of pressing the aesthetic elements into recesses in the recesses made in the support.
  • This document more specifically describes a inlay process by hot pressing of an aesthetic element made of amorphous metallic material within a ceramic support to form, for example, indices on a watch bezel.
  • the advantage of this process is that it is simple to carry out, very reproducible and compatible with most media. Inlaying different materials allows you to combine several colors and endings. However, the cost price of such parts is extremely high and the termination is often determined by the material used with a matt finish for materials such as rubber and a satin finish for metals. In addition, the achievable color palette is often limited or requires a very long development.
  • the object of the present invention is to propose a new method for manufacturing a decorative piece making it possible to widen the range of colors and terminations achievable while reducing the manufacturing cost.
  • the present invention provides a manufacturing method combining the advantages of the incrustation method by pressing an element within a support with the advantages of surface treatment by electrochemical means making it possible to modulate the colors and feasible terminations and form a protective layer on the encrusted element.
  • the present invention relates more particularly to the encrustation of conductive elements within supports made of an electrically non-conductive material such as ceramic. Therefore, the inventive nature of the invention lies in the production of contact points which are not visible but accessible on the support to bring the current to each embedded element.
  • the support comprises at least one recess intended to be filled by inlaying with an aesthetic element, said at least recess opens in one or more places on one side of the part intended to be invisible, to respectively form one or more contact points making it possible to convey current during the surface treatment on the aesthetic element. Thanks to these non-visible contact points, it is possible to bring current to fine and numerous decors such as on a tachymeter scale of a watch bezel. Depending on the treatment, a wide range of colors and even color gradations can be obtained on these decorations. These contact points make it possible to carry out the same electrochemical treatment for each decoration or possibly to combine different treatments by bringing the current to only one or more of the sets for each electrochemical treatment.
  • This electrochemical treatment is carried out on the decorations encrusted in their final surface condition: polished, satin, sanded and therefore at the end of the manufacturing process.
  • FIG. 1 shows in plan a decorative piece, and more precisely, a watch bezel comprising inlaid indices and treated electrochemically with the manufacturing process according to the invention.
  • Figure 2 shows a partial sectional view of the same decorative piece.
  • Figures 3 to 5 schematically represent the steps of inlaying the preform in the support.
  • FIG. 6A represents a view of the front face, that is to say of the visible face, of the bezel encrusted with several aesthetic elements, as well as a sectional view focused on an aesthetic element.
  • FIG. 6B represents a view of the rear face of this same telescope.
  • FIG. 7A represents a three-dimensional view of a watch case comprising on the middle a recess communicating with the bar hole.
  • FIG. 7B represents this same watch case comprising an aesthetic element embedded in the recess.
  • Figure 7C shows this same watch case including the aesthetic element embedded in the recess and set with stones.
  • the present invention relates to a method of manufacturing a decorative piece comprising a step of inlaying by hot pressing of one or more aesthetic elements in a support provided with one or more recesses and comprising a treatment step electrochemically surface of said aesthetic elements. It also relates to the decorative piece resulting from the process.
  • the piece may in particular be a component for covering watchmaking such as a bezel, a dial, a case, a crown, a push-piece, a crystal, a bracelet element, etc.
  • the part 1 is a watch bezel comprising an annular body forming the support 2 provided with recesses 4 provided in said support 2 to receive the aesthetic elements 3 forming the indices.
  • the part 1 is a middle part of a watch case 5 provided with two recesses 4 each inlaid with an aesthetic element 3 set with stones 6.
  • the support is made of an electrically non-conductive material such as ceramic, enamel, sapphire, etc.
  • the aesthetic element is made of an electrically conductive material such as a crystalline or amorphous metal alloy.
  • it may be an aluminum alloy, titanium or even precious metals such as gold alloys or platinoid alloys.
  • the part may consist of a zirconia watch bezel with indices produced in a crystalline aluminum alloy.
  • the support 2 comprises at least one recess 4 produced 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 (FIG. 2).
  • at least one of the recesses opens onto a non-visible face 2b of the support 2.
  • the entire volume of the recess 4 is filled with the aesthetic element 3 protruding or flush with the surface 2a of the support 2.
  • the aesthetic element only partially fills the volume of the recess.
  • the aesthetic elements are embedded by hot pressing in the recesses of the support.
  • the pressing temperature is variable depending on the material embedded.
  • the incrustation is carried out at a temperature between the solidus temperature and the liquidus temperature of the alloy constituting the aesthetic element.
  • the incrustation is carried out at a temperature between the glass transition temperature Tg and the crystallization temperature Tx of the alloy.
  • the pressure is adapted according to the material.
  • the applied load can be between 300 and 1000 kg.
  • the inlay takes place in a similar manner to that which is described in the document EP 2 315 673. More specifically, the inlay steps of the manufacturing process according to the invention are illustrated diagrammatically with the aid of FIGS.
  • the support 2 provided with the recesses 4 as well as the preform (s) intended to form the aesthetic element (s) 3 are made available (fig. 3).
  • the aesthetic element to be inlaid is in the form of an annular preform with a diameter and a ring width of dimensions substantially equivalent to those of the indices.
  • the preform 3 is placed on the surface 2a of the support 2 at the level of the recess 4.
  • the assembly is placed in a press and the inlaying under pressure P is carried out in the above-mentioned temperature ranges where the material is softened (fig. .4).
  • the step of encrusting the alloy in the recesses is then followed by a cooling step and a possible step of mechanical rectification of the upper surface 2a and of the aesthetic element 3 such as a polishing allowing 'remove the surplus from the aesthetic element 3 (fig.5) and make visible surfaces of the support and the aesthetic element connected to each other without a solution of continuity.
  • This finishing treatment consists of a selective electrochemical treatment of the embedded metallic material aiming to modify the appearance and / or the hardness of this material. It can be anodization with or without coloring, the deposit of a precious metal such as silver, gold, rhodium, platinum, etc. It is thus possible to encrust an aluminum alloy at a lower cost and then to make it hard with anodization or else to encrust a conductive material at a lower cost then to produce a plating of precious metals.
  • the supports targeted by the present invention being electrically non-conductive, the difficulty resides in the routing of the current to the aesthetic elements during the electrochemical treatment and, this, via contact points which must not be visible on the decorative piece.
  • one or more of the recesses are configured to lead to a face intended to be invisible from the decorative piece.
  • These recesses opening onto the non-visible face form as many contact points making it possible to bring the current to the embedded aesthetic elements.
  • the recess 4 for each of the indices opens onto the rear face 2b of the bezel 1 as illustrated in FIG. 2.
  • the contact points 4b allow to bring the current on each of the indices during the electrochemical treatment.
  • the aesthetic element 3 is larger, as in the examples in FIGS. 6A and 7B, several contact points per aesthetic element may be required to ensure uniform electrochemical treatment of the aesthetic element.
  • FIG. 6A by way of example, three aesthetic elements 3 are distributed over an annular portion of the visible face 2a of the telescope 1. In this configuration, the aesthetic elements
  • FIGS. 7B and 7C represent another configuration of an aesthetic element embedded in a recess formed in a support.
  • the inlaid aesthetic element 3 extends to a horn 5a of the case middle watch 5 and has a plurality of housings 3a for setting stones 6 in a subsequent operation, which is particularly advantageous for decorating watch cases made of materials which are not very ductile like ceramic.
  • the recess receiving the aesthetic element opens at least at one location on a non-visible face of the watch case. It is thus conceivable that the recess 4 communicates with the bar hole 7 as illustrated in FIG. 7A. Of course, the recess 4 can communicate in several places through other through orifices making it possible to produce contact points bringing the current to the aesthetic element 3.
  • the present invention thus makes it possible, thanks to the electrical contact point (s) formed on an invisible side 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 piece in watchmaking, but it goes without saying that the method according to the invention applies to the production of decorative pieces in many other fields such as jewelry, telephony, automobile, etc.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Adornments (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

The invention relates to a method for producing a part (1) comprising a support (2) made of a non-electroconductive material, said support (2) being provided with at least one cavity (4) filled with an aesthetic element (3) made of an electroconductive material, said aesthetic element (3) forming a decoration on a face (2a) of the part (1), which is intended to be visible, the method comprising: a step of inlaying by pressing a preform intended to form the aesthetic element (3) into said at least one cavity (4) of the support (2); and a step of electrochemical surface treatment of the aesthetic element (3), said at least one cavity (4) leading to at least one area on a face (2b) of the part (1), which is intended not to be visible, in order to respectively form at least one contact point (4b) allowing the application of current during the surface treatment on the aesthetic element (3).

Description

PROCEDE DE FABRICATION DE PI ECES DECORATIVES  PROCESS FOR MANUFACTURING DECORATIVE PIECES

DOMAINE TECHNIQUE TECHNICAL AREA

La présente invention se rapporte à un procédé de fabrication de pièces décoratives. Elle se rapporte plus particulièrement à un procédé de fabrication d’une pièce décorative comportant un élément esthétique conducteur incrusté dans un support réalisé dans un matériau non conducteur électrique. Le procédé de fabrication inclut à la suite de l’étape d’incrustation, une étape de traitement de surface par voie électrochimique des éléments incrustés. The present invention relates to a method of manufacturing decorative pieces. It relates more particularly to a method of manufacturing a decorative piece comprising a conductive aesthetic element embedded in a support made of an electrically non-conductive material. The manufacturing process includes, following the inlay step, an electrochemical surface treatment step of the embedded elements.

ART ANTERIEUR PRIOR 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 clockwork components with aesthetic elements. There are, for example, watch glasses decorated with patterns such as indices. These glasses, usually made of ceramic, can be marked in different ways and with different materials such as gold, silver or platinum. Said marking can be carried out in relief or in depth. In the case of deep marking, this is carried out by filling recesses previously machined in the support. The principle used to carry out this marking consists in depositing a conductive bonding layer by physical vapor deposition (PVD). Once the bonding layer has been deposited, the recesses are filled with metal by electroforming. This process 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. Ce procédé présente pour avantage d’être simple à réaliser, très reproductible et compatible avec la majorité des supports. Incruster différents matériaux permet de combiner plusieurs couleurs et terminaisons. Cependant, le coût de revient de telles pièces est extrêmement élevé et la terminaison est souvent déterminée par le matériau utilisé avec un rendu mat pour des matériaux tels que le caoutchouc et un rendu satiné pour les métaux. En outre, la palette de couleurs réalisable est souvent limitée ou demande un très long développement. Another method described in document EP 2 315 673 consists of pressing the aesthetic elements into recesses in the recesses made in the support. This document more specifically describes a inlay process by hot pressing of an aesthetic element made of amorphous metallic material within a ceramic support to form, for example, indices on a watch bezel. The advantage of this process is that it is simple to carry out, very reproducible and compatible with most media. Inlaying different materials allows you to combine several colors and endings. However, the cost price of such parts is extremely high and the termination is often determined by the material used with a matt finish for materials such as rubber and a satin finish for metals. In addition, the achievable color palette is often limited or requires a very long development.

RESUME DE L'INVENTION SUMMARY OF THE INVENTION

La présente invention a pour objet de proposer un nouveau procédé de fabrication d’une pièce décorative permettant d’élargir le panel de couleurs et terminaisons réalisables tout en diminuant le coût de fabrication. The object of the present invention is to propose a new method for manufacturing a decorative piece making it possible to widen the range of colors and terminations achievable while reducing the manufacturing cost.

A cet effet, la présente invention propose un procédé de fabrication combinant les avantages du procédé d’incrustation par pressage d’un élément au sein d’un support avec les avantages du traitement de surface par voie électrochimique permettant de moduler à souhait les couleurs et terminaisons réalisables et de former une couche protectrice sur l’élément incrusté.  To this end, the present invention provides a manufacturing method combining the advantages of the incrustation method by pressing an element within a support with the advantages of surface treatment by electrochemical means making it possible to modulate the colors and feasible terminations and form a protective layer on the encrusted element.

La présente invention concerne plus particulièrement l’incrustation d’éléments conducteurs au sein de supports réalisés dans un matériau non conducteur électrique tel que la céramique. Dès lors, le caractère inventif de l’invention réside dans la réalisation de points de contact non visibles mais accessibles sur le support pour amener le courant jusqu’à chaque élément incrusté.  The present invention relates more particularly to the encrustation of conductive elements within supports made of an electrically non-conductive material such as ceramic. Therefore, the inventive nature of the invention lies in the production of contact points which are not visible but accessible on the support to bring the current to each embedded element.

Pour ce faire, le support comporte au moins une creusure destinée à être remplie par incrustation avec un élément esthétique, ladite au moins creusure débouche en un ou plusieurs endroits sur une face de la pièce destinée à être non visible, pour former respectivement un ou plusieurs points de contact permettant d’acheminer du courant lors du traitement de surface sur l’élément esthétique. 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. Selon le traitement, une large palette de couleurs et même de dégradés de couleurs peut être obtenue sur ces décors. Ces points de contact permettent de réaliser un même traitement électrochimique pour chaque décor ou éventuellement de combiner différents traitements en amenant le courant sur seulement un ou plusieurs des décors pour chaque traitement électrochimique. Il est également envisageable d’incruster un élément réalisé dans un matériau à moindre coût et de le rendre ensuite dur par anodisation dans le cas de l’aluminium. Il est aussi envisageable d’incruster un élément réalisé dans un matériau métallique à moindre coût, puis ensuite de déposer des métaux précieux. La quantité de métaux précieux utilisée est ainsi minime et il n’y a pas de déchet de matière. To do this, the support comprises at least one recess intended to be filled by inlaying with an aesthetic element, said at least recess opens in one or more places on one side of the part intended to be invisible, to respectively form one or more contact points making it possible to convey current during the surface treatment on the aesthetic element. Thanks to these non-visible contact points, it is possible to bring current to fine and numerous decors such as on a tachymeter scale of a watch bezel. Depending on the treatment, a wide range of colors and even color gradations can be obtained on these decorations. These contact points make it possible to carry out the same electrochemical treatment for each decoration or possibly to combine different treatments by bringing the current to only one or more of the sets for each electrochemical treatment. It is also possible to embed an element made of a material at a lower cost and then to make it hard by anodization in the case of aluminum. It is also possible to embed an element made of a metallic material at a lower cost, then to deposit precious metals. The quantity of precious metals used is thus minimal and there is no waste of material.

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. This electrochemical treatment is carried out on the decorations encrusted in their final surface condition: polished, satin, sanded 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. BREVE DESCRIPTION DES FIGURES  Other characteristics and advantages of the present invention will appear in the following description of preferred embodiments, presented by way of nonlimiting example with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE FIGURES

La figure 1 représente en plan une pièce décorative, et plus précisément, une lunette de montre comportant des indices incrustés et traités électrochimiquement avec le procédé de fabrication selon l’invention. FIG. 1 shows in plan a decorative piece, and more precisely, a watch bezel comprising inlaid indices and treated electrochemically with the manufacturing process according to the invention.

La figure 2 représente une vue partielle en coupe de cette même pièce décorative. Les figures 3 à 5 représentent schématiquement les étapes d’incrustation de la préforme dans le support. Figure 2 shows a partial sectional view of the same decorative piece. Figures 3 to 5 schematically represent the steps of inlaying the preform in the support.

La figure 6A 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 focalisée sur un élément esthétique. La figure 6B représente une vue de la face arrière de cette même lunette.  FIG. 6A represents a view of the front face, that is to say of the visible face, of the bezel encrusted with several aesthetic elements, as well as a sectional view focused on an aesthetic element. FIG. 6B represents a view of the rear face of this same telescope.

La figure 7A représente une vue tridimensionnelle d’une boîte de montre comprenant sur la carrure une creusure communiquant avec le trou de barrette. La figure 7B représente cette même boîte de montre comprenant un élément esthétique incrusté dans la creusure. La figure 7C représente cette même boîte de montre comprenant l’élément esthétique incrusté dans la creusure et serti avec des pierres.  FIG. 7A represents a three-dimensional view of a watch case comprising on the middle a recess communicating with the bar hole. FIG. 7B represents this same watch case comprising an aesthetic element embedded in the recess. Figure 7C shows this same watch case including the aesthetic element embedded in the recess and set with stones.

DESCRIPTION DETAILLEE 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 ou plusieurs éléments esthétiques dans un support muni d’une ou plusieurs creusures et comportant une étape de traitement de surface par voie électrochimique desdits éléments esthétiques. Elle se rapporte aussi 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. A titre d’autre exemple illustré aux figures 7A à 7C, la pièce 1 est une carrure de boîte de montre 5 munie de deux creusures 4 incrustées chacune avec un élément esthétique 3 serti avec des pierres 6. Selon l’invention, le support est réalisé dans un matériau non conducteur électrique tel qu’une céramique, un émail, un saphir, etc. L’élément esthétique est quant à lui réalisé dans un matériau conducteur électrique tel qu’un alliage métallique cristallin ou amorphe. Par exemple, il peut s’agir d’un alliage d’aluminium, de titane ou encore de métaux précieux tels que des alliages d’or ou des alliages platinoïdes. Ainsi, toujours à titre d’exemple, la pièce peut consister en une lunette de montre en zircone avec des indices réalisés dans un alliage cristallin d’aluminium. DETAILED DESCRIPTION The present invention relates to a method of manufacturing a decorative piece comprising a step of inlaying by hot pressing of one or more aesthetic elements in a support provided with one or more recesses and comprising a treatment step electrochemically surface of said aesthetic elements. It also relates to the decorative piece resulting from the process. The piece may in particular be a component for covering watchmaking such as a bezel, a dial, a case, a crown, a push-piece, a crystal, a bracelet element, etc. By way of example illustrated in FIGS. 1 and 2, the part 1 is a watch bezel comprising an annular body forming the support 2 provided with recesses 4 provided in said support 2 to receive the aesthetic elements 3 forming the indices. As another example illustrated in FIGS. 7A to 7C, the part 1 is a middle part of a watch case 5 provided with two recesses 4 each inlaid with an aesthetic element 3 set with stones 6. According to the invention, the support is made of an electrically non-conductive material such as ceramic, enamel, sapphire, etc. The aesthetic element is made of an electrically conductive material such as a crystalline or amorphous metal alloy. For example, it may be an aluminum alloy, titanium or even precious metals such as gold alloys or platinoid alloys. Thus, again by way of example, the part may consist of a zirconia watch bezel with indices produced in a crystalline aluminum alloy.

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 (fig.2). Selon l’invention, au moins une des creusures débouche sur une face non visible 2b du support 2. 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. The support 2 comprises at least one recess 4 produced 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 (FIG. 2). According to the invention, at least one of the recesses opens onto a non-visible face 2b of the support 2. Advantageously, the entire volume of the recess 4 is filled with the aesthetic element 3 protruding or flush with the surface 2a of the support 2. Alternatively, it is also conceivable that the aesthetic element only partially fills the volume of the recess.

Selon l’invention, les éléments esthétiques sont incrustés par pressage à chaud dans les creusures du support. La température de pressage est variable selon le matériau incrusté. Par exemple, pour un alliage métallique cristallin, l’incrustation est réalisée à une température comprise entre la température de solidus et la température de liquidus de l’alliage constituant l’élément esthétique. Pour un alliage métallique amorphe, l’incrustation est réalisée à une température comprise entre la température de transition vitreuse Tg et la température de cristallisation Tx de l’alliage. De même, la pression est adaptée selon le matériau. Par exemple, la charge appliquée peut être comprise entre 300 et 1000 kg. L’incrustation se déroule de manière semblable à ce qui est décrit dans le document EP 2 315 673. Plus précisément, les étapes d’incrustation du procédé de fabrication selon l’invention sont illustrées schématiquement à l’aide des figures 3 à 5. Tout d’abord, le support 2 muni de la ou des creusures 4 ainsi que la ou les préformes destinées à former le ou les éléments esthétiques 3 sont mises à disposition (fig.3). Dans le cas d’une lunette de montre à décorer avec des indices, 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. La préforme 3 est placée sur la surface 2a du support 2 au niveau de la creusure 4. L’ensemble est placé dans une presse et l’incrustation sous une pression P est réalisée dans les gammes de températures susmentionnées où le matériau est ramolli (fig.4). L’étape d’incrustation de l’alliage dans les creusures est ensuite suivie d’une étape de refroidissement et d’une éventuelle étape de rectification mécanique de la surface supérieure 2a et de l’élément esthétique 3 telle qu’un polissage permettant d’enlever le surplus de l’élément esthétique 3 (fig.5) 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 embedded by hot pressing in the recesses of the support. The pressing temperature is variable depending on the material embedded. For example, for a crystalline metal alloy, the incrustation is carried out at a temperature between the solidus temperature and the liquidus temperature of the alloy constituting the aesthetic element. For an amorphous metal alloy, the incrustation is carried out at a temperature between the glass transition temperature Tg and the crystallization temperature Tx of the alloy. Likewise, the pressure is adapted according to the material. For example, the applied load can be between 300 and 1000 kg. The inlay takes place in a similar manner to that which is described in the document EP 2 315 673. More specifically, the inlay steps of the manufacturing process according to the invention are illustrated diagrammatically with the aid of FIGS. 3 to 5. First of all, the support 2 provided with the recesses 4 as well as the preform (s) intended to form the aesthetic element (s) 3 are made available (fig. 3). In the case of a watch bezel to be decorated with indices, the aesthetic element to be inlaid is in the form of an annular preform with a diameter and a ring width of dimensions substantially equivalent to those of the indices. The preform 3 is placed on the surface 2a of the support 2 at the level of the recess 4. The assembly is placed in a press and the inlaying under pressure P is carried out in the above-mentioned temperature ranges where the material is softened (fig. .4). The step of encrusting the alloy in the recesses is then followed by a cooling step and a possible step of mechanical rectification of the upper surface 2a and of the aesthetic element 3 such as a polishing allowing 'remove the surplus from the aesthetic element 3 (fig.5) and make visible surfaces of the support and the aesthetic element connected to each other without a 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. La préforme a été chauffée à 550°C pendant 90 secondes et pressée sous une charge de l’ordre de 750 kg.  For example, in the case of an inlay of the metal alloy of aluminum 7075 in a support based on zirconia. The preform was heated to 550 ° C for 90 seconds and pressed under a load of the order of 750 kg.

Après l’étape d’incrustation et l’éventuelle étape de rectification mécanique, l’élément esthétique est soumis à un traitement de finition. Ce traitement de finition consiste en un traitement électrochimique sélectif de la matière métallique incrustée visant à modifier l’apparence et/ou la dureté de cette matière. Il peut s’agir d’une anodisation avec ou sans coloration, du dépôt d’un métal précieux tel que l’argent, l’or, le rhodium, le platine, etc. Il est ainsi envisageable d’incruster un alliage d’aluminium à moindre coût puis de le rendre dur avec une anodisation ou encore d’incruster une matière conductrice à moindre coût puis de réaliser un placage de métaux précieux. Les supports visés par la présente invention étant 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 être impérativement 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 métalliques réalisés par incrustation, la creusure 4 pour chacun des indices débouche sur la face arrière 2b de la lunette 1 comme illustré à la figure 2. 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 supportAfter the incrustation step and the possible mechanical rectification step, the aesthetic element is subjected to a finishing treatment. This finishing treatment consists of a selective electrochemical treatment of the embedded metallic material aiming to modify the appearance and / or the hardness of this material. It can be anodization with or without coloring, the deposit of a precious metal such as silver, gold, rhodium, platinum, etc. It is thus possible to encrust an aluminum alloy at a lower cost and then to make it hard with anodization or else to encrust a conductive material at a lower cost then to produce a plating of precious metals. The supports targeted by the present invention being electrically non-conductive, the difficulty resides in the routing of the current to the aesthetic elements during the electrochemical treatment and, this, via contact points which must not be visible on the decorative piece. To this end, one or more of the recesses are configured to lead to a face intended to be invisible from the decorative piece. These recesses opening onto the non-visible face form as many contact points making it possible to bring the current to the embedded aesthetic elements. Returning to the example of the ceramic watch bezel comprising metal indices produced by inlay, the recess 4 for each of the indices opens onto the rear face 2b of the bezel 1 as illustrated in FIG. 2. The contact points 4b allow to bring the current on each of the indices during the electrochemical treatment. These contact points 4b on the rear face 2b of the 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 en amenant le courant sur seulement un ou plusieurs des indices pour chaque traitement électrochimique. 2 can 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 by bringing the running on 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 6A et 7B, plusieurs points de contact par élément esthétique peuvent être requis pour assurer un traitement électrochimique uniforme de l’élément esthétique. A la figure 6A, 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 If the aesthetic element 3 is larger, as in the examples in FIGS. 6A and 7B, several contact points per aesthetic element may be required to ensure uniform electrochemical treatment of the aesthetic element. In FIG. 6A, by way of example, three aesthetic elements 3 are distributed over an annular portion of the visible face 2a of the telescope 1. In this configuration, the aesthetic elements

3 sont incrustés sur le substrat 2 incluant les indices réalisés dans un matériau non conducteur. Sur sa face arrière 2b visible à la figure 6B, 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 6A sur la vue en coupe, deux points de contact 4b sont prévus par élément esthétique 3. Les figures 7B et 7C représentent une autre configuration d’un élément esthétique incrusté dans une creusure ménagée dans un support. L’élément esthétique incrusté 3 s’étend jusqu’à une corne 5a de la carrure de la boîte de montre 5 et comporte une pluralité de logements 3a pour le sertissage de pierres 6 dans une opération ultérieure, ce qui est particulièrement avantageux pour décorer des boites de montre en matériaux peu ductile comme la céramique. 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 7 comme illustré à la figure 7A. 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. 3 are embedded on the substrate 2 including the indicia made of a non-conductive material. On its rear face 2b visible in FIG. 6B, the telescope 1 is provided with several orifices 4b communicating with the recesses 4 to produce the contact points making it possible to bring the current to these three elements. As shown in FIG. 6A in the sectional view, two contact points 4b are provided per aesthetic element 3. FIGS. 7B and 7C represent another configuration of an aesthetic element embedded in a recess formed in a support. The inlaid aesthetic element 3 extends to a horn 5a of the case middle watch 5 and has a plurality of housings 3a for setting stones 6 in a subsequent operation, which is particularly advantageous for decorating watch cases made of materials which are not very ductile like ceramic. Similarly to the other examples, the recess receiving the aesthetic element opens at least at one location on a non-visible face of the watch case. It is thus conceivable that the recess 4 communicates with the bar hole 7 as illustrated in FIG. 7A. Of course, the recess 4 can communicate in several places through other through orifices making it possible to produce contact points bringing the current to the aesthetic element 3. The present invention thus makes it possible, thanks to the electrical contact point (s) formed on an invisible side 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 piece in watchmaking, but it goes without saying that the method according to the invention applies to the production of decorative pieces in many other fields such as jewelry, telephony, automobile, etc.

Légende des figures Legend of figures

(1 ) Pièce décorative (1) Decorative piece

(2) Support  (2) Support

a. Face visible  at. Visible face

b. Face invisible  b. Invisible face

(3) Elément esthétique ou préforme  (3) Aesthetic element or preform

a. Logement  at. Housing

(4) Creusure  (4) Digging

a. Partie débouchant sur la face visible du support  at. Part leading to the visible face of the support

b. Partie débouchant sur la face non visible du support, aussi appelée point de contact  b. Part leading to the non visible side of the support, also called contact point

(5) Boîte de montre (5) Watch box

a. Corne (6) Pierre at. Horn (6) Stone

(7) Trou de barrette  (7) Bar hole

Claims

REVENDICATIONS 1. Procédé de fabrication d’une pièce (1 ) comprenant un support (2) réalisé dans un matériau non conducteur électrique, ledit support (2) étant muni d’au moins une creusure (4) remplie avec un élément esthétique (3) réalisé dans un matériau conducteur électrique, ledit élément esthétique (3) formant un décor sur une face (2a) de la pièce (1 ) destinée à être visible, le procédé comprenant les étapes de :  1. Method for manufacturing a part (1) comprising a support (2) made of an electrically non-conductive material, said support (2) being provided with at least one recess (4) filled with an aesthetic element (3) made of an electrically conductive material, said aesthetic element (3) forming a decoration on one face (2a) of the part (1) intended to be visible, the method comprising the steps of: - mise à disposition du support (2) muni de ladite au moins creusure (4) et mise à disposition d’une préforme destinée à former l’élément esthétique (3) de la pièce (1 ),  - provision of the support (2) provided with said at least one recess (4) and provision of a preform intended to form the aesthetic element (3) of the part (1), - incrustation par pressage de la préforme dans ladite au moins creusure (4) du support (2),  - inlay by pressing the preform into said at least one recess (4) of the support (2), le procédé étant caractérisé en ce qu’il comporte ensuite une étape de traitement de surface par voie électrochimique de l’élément esthétique (3), ladite au moins creusure (4) débouchant en un ou plusieurs endroits sur une face (2b) de la pièce (1 ) destinée à être non visible, pour former respectivement un ou plusieurs points de contact (4b) permettant d’amener du courant lors du traitement de surface sur l’élément esthétique (3).  the method being characterized in that it then comprises a step of surface treatment by electrochemical means of the aesthetic element (3), said at least recess (4) opening out in one or more places on one face (2b) of the part (1) intended to be invisible, to respectively form one or more contact points (4b) making it possible to bring current during the surface treatment on the aesthetic element (3). 2. Procédé selon la revendication 1 , caractérisé en ce que le support 2. Method according to claim 1, characterized in that the support (2) est réalisé dans un matériau choisi parmi la céramique, le saphir et l’émail. (2) is made of a material chosen from ceramic, sapphire and enamel. 3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l’élément esthétique (3) est réalisé dans un métal amorphe, un métal cristallin ou un de leurs alliages.  3. Method according to claim 1 or 2, characterized in that the aesthetic element (3) is made of an amorphous metal, a crystalline metal or one of their alloys. 4. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que l’élément esthétique (3) est réalisé dans un alliage d’aluminium, de titane ou d’un métal précieux. 4. Method according to any one of the preceding claims, characterized in that the aesthetic element (3) is made of an alloy of aluminum, titanium or a precious metal. 5. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que ladite étape de traitement de surface par voie électrochimique est réalisée après une étape de rectification mécanique suivant l’étape d’incrustation. 5. Method according to any one of the preceding claims, characterized in that the said electrochemical surface treatment step is carried out after a mechanical rectification step following the incrustation step. 6. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que ladite étape de traitement de surface par voie électrochimique est réalisée après une étape de sertissage de pierres (6) sur l’élément esthétique (3) incrusté dans ladite au moins creusure (4). 6. Method according to any one of the preceding claims, characterized in that said step of surface treatment by electrochemical means is carried out after a step of crimping stones (6) on the aesthetic element (3) embedded in said at least recess (4). 7. Procédé selon l’une quelconque des revendications précédentes, caractérisé en ce que ladite étape de traitement de surface par voie électrochimique est une anodisation ou un dépôt d’un métal, notamment d’un métal précieux. 7. Method according to any one of the preceding claims, characterized in that said step of surface treatment by electrochemical means is anodization or deposition of a metal, in particular a precious metal. 8. Pièce (1 ) comprenant un support (2) réalisé dans un matériau non conducteur électrique, ledit support (2) étant muni d’au moins une creusure (4) incrustée avec un élément esthétique (3) réalisé dans un matériau conducteur électrique, ledit élément esthétique (3) formant un décor sur une face (2a) visible de la pièce (1 ), la pièce (1 ) étant caractérisée en ce que ladite au moins creusure (4) débouche en un ou plusieurs endroits sur une face (2b) de la pièce (1 ) destinée à être non visible et en ce que l’élément esthétique (3) comporte en surface une couche de revêtement.  8. Piece (1) comprising a support (2) made of an electrically non-conductive material, said support (2) being provided with at least one recess (4) embedded with an aesthetic element (3) made of an electrically conductive material , said aesthetic element (3) forming a decoration on a face (2a) visible from the part (1), the part (1) being characterized in that said at least recess (4) opens in one or more places on one face (2b) of the part (1) intended to be invisible and in that the aesthetic element (3) has a coating layer on the surface. 9. Pièce (1 ) selon la revendication 8, caractérisée en ce que la couche de revêtement est une couche anodisée ou une couche métallique notamment d’un métal précieux.  9. Piece (1) according to claim 8, characterized in that the coating layer is an anodized layer or a metallic layer in particular of a precious metal. 10. Pièce (1 ) selon la revendication 8 ou 9, caractérisée en ce que le support (2) est réalisé dans un matériau choisi parmi la céramique, le saphir et l’émail.  10. Piece (1) according to claim 8 or 9, characterized in that the support (2) is made of a material chosen from ceramic, sapphire and enamel. 11. Pièce (1 ) selon l’une quelconque des revendications 8 à 10, caractérisée en ce que l’élément esthétique (3) est réalisé dans un métal amorphe, un métal cristallin ou un de leurs alliages. 11. Part (1) according to any one of claims 8 to 10, characterized in that the aesthetic element (3) is made of an amorphous metal, a crystalline metal or one of their alloys. 12. Pièce (1 ) selon l’une quelconque des revendications 8 à 11 , caractérisée en ce que l’élément esthétique (3) est réalisé dans un alliage d’aluminium, de titane ou de métaux précieux. 12. Piece (1) according to any one of claims 8 to 11, characterized in that the aesthetic element (3) is made of an alloy of aluminum, titanium or precious metals. 13. Pièce (1 ) selon l’une quelconque des revendications 8 à 12, caractérisée en ce qu’il s’agit d’un composant d’habillage en horlogerie ou en joaillerie.  13. Piece (1) according to any one of claims 8 to 12, characterized in that it is a covering component in watchmaking or in jewelry. 14. Pièce (1 ) selon la revendication 13, caractérisée en ce qu’il s’agit d’une lunette de montre formant le support (2) avec ladite au moins creusure (4) incrustée avec l’élément esthétique (3) formant un indice ou une portion annulaire de la lunette.  14. Piece (1) according to claim 13, characterized in that it is a watch bezel forming the support (2) with said at least recess (4) encrusted with the aesthetic element (3) forming an index or an annular portion of the telescope. 15. Pièce (1 ) selon la revendication 13, caractérisée en ce qu’il s’agit d’une carrure formant le support (2) avec ladite au moins creusure (4) incrustée avec l’élément esthétique (3) formant une portion de la carrure s’étendant jusqu’à une corne (5a) de la carrure.  15. Piece (1) according to claim 13, characterized in that it is a middle part forming the support (2) with said at least recess (4) embedded with the aesthetic element (3) forming a portion of the middle extending to a horn (5a) of the middle. 16. Pièce (1 ) selon la revendication 15, caractérisée en ce que ladite au moins creusure (4) communique avec un trou de barrette (7) disposé dans la corne (5a) de la carrure.  16. Piece (1) according to claim 15, characterized in that said at least one recess (4) communicates with a bar hole (7) disposed in the horn (5a) of the middle part.
EP19730182.3A 2018-06-28 2019-06-18 Method for manufacturing decorative parts Active EP3814553B1 (en)

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EP18180562.3A EP3587625A1 (en) 2018-06-28 2018-06-28 Method for manufacturing decorative parts
PCT/EP2019/066099 WO2020002060A1 (en) 2018-06-28 2019-06-18 Method for producing decorative parts

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US11914331B2 (en) 2024-02-27
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EP3587625A1 (en) 2020-01-01
CN112119183A (en) 2020-12-22
TW202014262A (en) 2020-04-16
US20210208541A1 (en) 2021-07-08
JP2021518881A (en) 2021-08-05
KR102435084B1 (en) 2022-08-23
EP3814553B1 (en) 2024-01-17
JP7075501B2 (en) 2022-05-25
TWI753264B (en) 2022-01-21

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