CH709728A2 - Watchmaking component in welded materials. - Google Patents

Abstract

The invention relates to a watch component (21) comprising a first piece (25, 27) based on silicon, a second piece (25, 27) based on metal. According to the invention, a surface (24, 28, 30, 31) of the first part is welded by electromagnetic radiation to a surface of the second part in order to secure them.

Description

Field of the invention

The invention relates to a watch component made of welded materials and in particular such a component comprising a material based on silicon or ceramic.

Background of the invention

Current assemblies comprising a silicon-based part are generally secured by gluing. Such an operation requires extreme finesse of application which makes it expensive.

It has also been developed silicon-based parts with elastic deformation zones in order to assemble them. However, depending on the application, gluing may sometimes always be necessary to maintain a sufficient assembly force.

Finally, it has also been developed intermediate parts capable of deforming plastically to be driven while protecting the silicon-based part. However, they do not always give satisfaction because, depending on the applications, they can be difficult to implement.

Summary of the invention

The object of the present invention is to overcome all or part of the disadvantages mentioned above by providing a watch component formed from a part comprising a silicon-based material or ceramic which is directly welded electromagnetic radiation on a another piece such as, for example, a metal or a metal alloy.

For this purpose, according to a first embodiment, the invention relates to a watch component comprising a first silicon-based part, a second metal-based part characterized in that a surface of the first part is welded by electromagnetic radiation to a surface of the second piece to secure them.

According to the invention, the first silicon-based part comprises monocrystalline silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, silicon oxide, quartz, silica, silicon nitride or silicon carbide.

According to a second embodiment, the invention relates to a watch component, comprising a first ceramic-based part, a second metal-based part characterized in that a surface of the first part is welded by electromagnetic radiation on a surface of the second piece to secure them.

According to the invention, the first ceramic-based part comprises photostructurable glass, borosilicate, aluminosilicate, quartz glass, zerodur, monocrystalline corundum, polycrystalline corundum, alumina, aluminum oxide, aluminum nitride, monocrystalline ruby, polycrystalline ruby, zirconium oxide, titanium oxide, titanium nitride, titanium carbide, tungsten nitride, tungsten carbide, boron nitride or boron carbide.

Advantageously according to the two embodiments of the invention, it is understood that it is not necessary to provide the material to secure the two materials. In addition, already developed parts can be used and now welded with better adhesion and a guarantee of durability higher than with bonding. Finally, the direct welding of the surfaces makes the fastening substantially invisible.

According to other advantageous variants of the two embodiments of the invention: the first silicon-based or ceramic-based part also comprises at least one partial coating of silicon oxide, silicon nitride, silicon carbide or a carbon allotrope; one of the first and second pieces is opaque to the wavelength of said electromagnetic radiation to weld said surfaces of the first and second pieces when they are against each other; the first and second parts are transparent to the wavelength of said electromagnetic radiation, an intermediate material being deposited at the interface of the first and second parts to weld said surfaces of the first and second parts; the first piece and / or the second piece forms a hairspring, an ankle, a rocker, an axis, a plate, an anchor, a rod, a rod, a fork, a pallet, a dart, a mobile, a wheel, a shaft, pinion, deck, turntable, oscillating weight, winding stem, bearing or bearing; the second piece comprises an iron alloy, a copper alloy, nickel or one of its alloys, titanium or one of its alloys, gold or one of its alloys, silver or one of its alloys, platinum or one of its alloys, ruthenium or one of its alloys, rhodium or one of its alloys or palladium or one of its alloys.

Finally, the invention relates to a timepiece characterized in that it comprises a watch component according to one of the preceding variants.

Brief description of the drawings

Other features and advantages will become apparent from the description which is given below, for information only and not limiting, with reference to the accompanying drawings, in which: <tb> fig. 1 <SEP> is a perspective representation of watch components according to the present invention; <tb> fig. 2 <SEP> is a sectional view of a watch component according to the invention.

Detailed Description of the Preferred Embodiments

As explained above, the invention relates to a component formed using a workpiece whose material does not include a usable plastic field, that is to say with a very restricted plastic field , with a second piece having the same type of material or another type of material.

This component has been devised for applications in the field of watchmaking and is made necessary by the increasing share that hold fragile materials such as those based on silicon or ceramic. By way of example, it is possible to envisage forming the hairspring, the balance, the anchor, the bridges, the oscillating weight or even the mobiles such as the escape wheels totally or partially based on fragile materials.

However, the fact of always being able to use usual parts such as, for example, steel shafts whose manufacture is controlled, is a constraint that is difficult to reconcile with the use of parts that do not include a plastic field. Indeed, during tests carried out, the driving of a steel shaft is impossible and systematically breaks the fragile parts, that is to say not having a usable plastic field. For example, it has been found that the shear generated by the entry of the metal axis into the opening of a monocrystalline silicon part coated with silicon dioxide systematically breaks the latter.

Therefore, according to a first embodiment, the invention relates to a watch component comprising a first silicon-based part, a second metal-based part characterized in that a surface of the first part is welded by electromagnetic radiation on a surface of the second piece to secure them.

Advantageously according to the invention, it is understood that it is not mandatory to bring the material to secure the two parts as for gluing or the use of an intermediate portion. It is also not necessary to form particular structures in the first room to assemble in the second room. Thus, for example, a simple hole for cooperating with a corresponding section axis is sufficient, the hole being formed in the first part or in the second part.

It is therefore understood that the already developed parts can be used and now welded by electromagnetic radiation with better adhesion and a guarantee of staying in time higher than with a collage. Finally, the direct welding of the surfaces makes the fastening substantially invisible. Indeed, it suffices that one of the first and second parts is opaque and another transparent to the wavelength of said electromagnetic radiation to weld said surfaces of the first and second parts when they are against one another. other. Such electromagnetic radiation welding is, for example, explained in EP 1 436 830 incorporated by reference in this specification. In addition, as explained in EP 1 436 830, if the first and second parts are transparent to the wavelength of said electromagnetic radiation, optionally an intermediate material for promoting the bonding between the two materials can be used. . Thus, this intermediate material forms a layer intended to induce a sufficiently intense heating to generate the melting of the two materials.

According to the first embodiment, the first silicon-based part preferably comprises monocrystalline silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, silicon oxide and the like. silicon, quartz, silica, silicon nitride or silicon carbide. In addition, the first silicon-based part may further optionally comprise at least one partial coating of silicon oxide, silicon nitride, silicon carbide or a carbon allotrope according to the intended applications of the watch component.

According to a second embodiment, the invention relates to a watch component comprising a first ceramic-based part, a second metal-based part characterized in that a surface of the first part is radially welded. electromagnetic on a surface of the second piece to secure them.

Advantageously according to the invention, it is understood that it is not mandatory to bring the material to secure the two parts as for gluing or the use of an intermediate portion. It is also not necessary to form particular structures in the first room to assemble in the second room. Thus, for example, a simple hole for cooperating with a corresponding section axis is sufficient, the hole being formed in the first part or in the second part.

It is therefore understood that the already developed parts can be used and now welded by electromagnetic radiation with better adhesion and a guarantee of staying with time higher than with a bonding. Finally, the direct welding of the surfaces makes the fastening substantially invisible. Indeed, it suffices that one of the first and second parts is opaque and another transparent to the wavelength of said electromagnetic radiation to weld said surfaces of the first and second parts when they are against one another. other. Such electromagnetic radiation welding is, for example, explained in EP 1 436 830 incorporated by reference in this specification. In addition, as explained in EP 1 436 830, if the first and second parts are transparent to the wavelength of said electromagnetic radiation, optionally an intermediate material for promoting the bonding between the two materials can be used. . Thus, this intermediate material forms a layer intended to induce a sufficiently intense heating to generate the melting of the two materials.

According to the second embodiment, the first ceramic-based part comprises photostructurable glass, borosilicate, aluminosilicate, quartz glass, zerodur, monocrystalline corundum, polycrystalline corundum, alumina , aluminum oxide, aluminum nitride, monocrystalline ruby, polycrystalline ruby, zirconium oxide, titanium oxide, titanium nitride, titanium carbide, nitride of tungsten, tungsten carbide, boron nitride or boron carbide. In addition, the first ceramic-based part may further optionally comprise at least one partial coating of silicon oxide, silicon nitride, silicon carbide or a carbon allotrope according to the intended applications of the watch component.

According to the two embodiments, the second part preferably comprises an iron alloy such as 15P, 20AP or 316L steel, a copper alloy such as brass, a nickel alloy such as nickel silver, titanium or a nickel. of its alloys, gold or one of its alloys, silver or one of its alloys, platinum or one of its alloys, ruthenium or one of its alloys, rhodium or one of its alloys or palladium or one of its alloys.

According to the two embodiments of the invention, the first piece and / or the second piece can form a wide variety of watch components for a timepiece. By way of non-limiting examples and with reference to FIG. 1, the first piece and / or the second piece can thus form in particular a hairspring 1, an ankle 2, a rocker 3, an axis 4, a plate 5, an anchor 6 such as a rod 7, a rod 8, a fork 9 , a pallet 10 and a dart 11, a mobile 12 such as a wheel 13, a shaft 14 and a pinion 15, a bridge 16, a plate 17, an oscillating mass 18, a winding rod 19 or a pad 20.

By way of example, FIG. 2 shows a watchmaking component 21 forming a rocker-spiral resonator 23 rotatably mounted on an axis 25. The spiral 22 comprises a blade extending in a plurality of turns and is mounted on a first bearing surface 24 of the shaft 25 by means of a ferrule 26. The rocker 27 is mounted on a second bearing 28 of the shaft 25 by means of a hub 29.

It is therefore understood, for example, that the axis 25 can directly be welded by electromagnetic radiation such as a laser at its bearing surfaces 24, 28 and / or its cylindrical surfaces 30, 31 respectively against the spiral 22 and / or the pendulum 27. It is sufficient that either the axis 25, or the spiral 22 and / or the balance 27, is transparent to the wavelength of said electromagnetic radiation for welding the surfaces in contact. Of course, other types of contact surfaces may be provided such as sloped surfaces or non-rectilinear surfaces.

The present invention is not limited to the example shown but is susceptible to various variations and modifications that will occur to those skilled in the art. In particular, the second piece may be of another type of material than a metal or a metal alloy. Thus, without limitation, the second piece may also be of the same material as the first piece, ceramic or a semiconductor material.

However, in this case, as explained in EP 1 436 830, if the first and second parts are transparent to the wavelength of said electromagnetic radiation, optionally an intermediate material for promoting the bonding between both materials, must be used. Indeed, this intermediate material would then form a layer intended to induce heating sufficiently intense to generate the fusion of the two transparent materials at the wavelength of said electromagnetic radiation.

As explained above, the first piece and / or the second piece can form a variety of watch components. As additional examples in FIG. 2, an anchor 6 could be formed from a first piece forming the rod 8, the pallets 10 and the fork 9 and a first second piece forming the rod 7 and a second second piece forming the dart 11. A mobile 12 could be formed from a first piece forming a shaft 14 and a pinion 15 and a second piece forming a wheel 13. A resonator assembly could be formed from a first piece forming a housing provided with a cavity, a first second part forming a tuning fork resonator and a second second part forming the cover enclosing the resonator in the housing.

In addition, a first piece could form a plate 5 and be secured to a second piece forming an ankle 2, a first piece could form a plate 17 or a bridge 16 and be secured to several second pieces forming pads 20 or a first piece could form an oscillating mass 18 and be integral with a second part forming a rolling cage.

Finally, said at least one optional partial coating can be limited to silicon oxide, silicon nitride, silicon carbide or an allotrope of carbon. Thus, depending on the intended applications of the watch component, other materials may be envisaged for, for example, improving the tribological, thermal or visual qualities of the watch component. By way of example, at least one partial thermal compensation coating may be deposited.

Claims (11)

Watchmaking component (21) comprising a first part (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 25, 27), a second component (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 , 18, 19, 20, 22, 25, 27) characterized in that a surface (24, 28, 30, 31) of the first piece is electromagnetically radiated on a surface of the second piece so that to secure them. 2. watch component (21) according to the preceding claim, characterized in that the first silicon-based part comprises single-crystal silicon, doped monocrystalline silicon, polycrystalline silicon, doped polycrystalline silicon, porous silicon, oxide silicon, quartz, silica, silicon nitride or silicon carbide. 3. watch component (21) according to the preceding claim, characterized in that the first silicon-based part further comprises at least one partial coating of silicon oxide, silicon nitride, silicon carbide or a carbon allotrope. 4. Watch component (21) comprising a first part (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 25, 27), a second piece (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 , 18, 19, 20, 22, 25, 27) characterized in that a surface (24, 28, 30, 31) of the first piece is electromagnetically radiated on a surface of the second piece to to secure them. 5. Watchmaking component (21) according to the preceding claim, characterized in that the first ceramic-based part comprises photostructurable glass, borosilicate, aluminosilicate, quartz glass, zerodur, monocrystalline corundum, corundum polycrystalline, alumina, aluminum oxide, aluminum nitride, monocrystalline ruby, polycrystalline ruby, zirconium oxide, titanium oxide, titanium nitride, carbide titanium, tungsten nitride, tungsten carbide, boron nitride or boron carbide. 6. Watchmaking component (21) according to the preceding claim, characterized in that the first ceramic-based part further comprises at least one partial coating of silicon oxide, silicon nitride, silicon carbide or a carbon allotrope. Watchmaking component (21) according to one of the preceding claims, characterized in that one of the first and second parts (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 22, 25, 27) is opaque to the wavelength of said electromagnetic radiation to weld said surfaces of the first and second parts when they are against each other. 8. Watchmaking component (21) according to one of claims 1 to 6, characterized in that the first and second parts (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 , 13, 14, 15, 16, 17, 18, 19, 20, 22, 25, 27) are transparent to the wavelength of said electromagnetic radiation, an intermediate material being deposited at the interface of the first and second parts so welding said surfaces of the first and second parts. 9. Watchmaking component (21) according to one of the preceding claims, characterized in that the first piece and / or the second piece forms a hairspring (1, 22), an ankle (2), a rocker (3, 27). , an axle (4, 25), a plate (5), an anchor (6), a rod (7), a rod (8), a fork (9), a pallet (10), a dart (11) , a wheel (12), a wheel (13), a shaft (14), a pinion (15), a bridge (16), a plate (17), an oscillating weight (18), a winding stem (19) ), a bearing or a bearing (20). 10. Watchmaking component (21) according to one of the preceding claims, characterized in that the second part comprises an iron alloy, a copper alloy, nickel or one of its alloys, titanium or one of its alloys, gold or one of its alloys, silver or one of its alloys, platinum or one of its alloys, ruthenium or one of its alloys, rhodium or one of its alloys or palladium or one of its alloys . 11. Timepiece characterized in that it comprises a timepiece component (21) according to one of the preceding claims.