EP2686134B1 - Polishing system for a piece of a watchcase - Google Patents

Polishing system for a piece of a watchcase Download PDF

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Publication number
EP2686134B1
EP2686134B1 EP12704793.4A EP12704793A EP2686134B1 EP 2686134 B1 EP2686134 B1 EP 2686134B1 EP 12704793 A EP12704793 A EP 12704793A EP 2686134 B1 EP2686134 B1 EP 2686134B1
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EP
European Patent Office
Prior art keywords
curvature
piece
axis
support
abrasive means
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EP12704793.4A
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German (de)
French (fr)
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EP2686134A1 (en
Inventor
Jean-Paul Tassetti
Gilles Derriey
Patrice Dumont
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Comadur SA
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Comadur SA
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Priority to EP12704793.4A priority Critical patent/EP2686134B1/en
Publication of EP2686134A1 publication Critical patent/EP2686134A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/02—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor by means of tools with abrading surfaces corresponding in shape with the lenses to be made
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
    • B24B13/04—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor grinding of lenses involving grinding wheels controlled by gearing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B47/00—Drives or gearings; Equipment therefor
    • B24B47/02—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables
    • B24B47/04—Drives or gearings; Equipment therefor for performing a reciprocating movement of carriages or work- tables by mechanical gearing only
    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D3/00—Watchmakers' or watch-repairers' machines or tools for working materials
    • G04D3/06—Devices for shaping or setting watch glasses

Definitions

  • the invention relates to a system for polishing a trim piece for a timepiece and in particular the concave surface of such a piece.
  • the object of the present invention is to overcome all or part of the disadvantages mentioned above by proposing a piece-to-piece polishing system which does not deform the blanks and allows improved polishing of complex concave surfaces with a very low scrap rate.
  • the invention relates to a system for polishing a concave surface of a trim piece for a timepiece according to claim 1.
  • the polishing is carried out piece by piece by contact of the workpiece against the abrasive means.
  • the back-and-forth movement of the support then forces the part to follow the curved contact surface of the abrasive means.
  • the polishing is therefore performed by moving the pieces one by one against the abrasive means rotatably mounted along a fixed axis which allows a very low scrap rate by avoiding the degradation of the concave surface roughened before polishing.
  • the invention relates to a piece of clothing of a timepiece such as an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby.
  • the invention relates to new manufacturing systems for roughing and polishing such pieces of complex shape.
  • a timepiece such as an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby.
  • the invention relates to new manufacturing systems for roughing and polishing such pieces of complex shape.
  • Other applications are also conceivable, such as optics, tableware or electronics.
  • a manufacturing system 1 has been developed in order to produce trim parts 3 comprising surfaces whose curvatures C 1 , C 2 are concave.
  • the manufacturing system 1 comprises a fixing device 5 and a machining device 7.
  • the fixing device 5 comprises a drum 11 rotatably mounted along a first axis A 1 and carrying at least one blank 3 'of the future part 3.
  • the drum 11 is a ring having a faceted internal wall, that is to say provided with successive planes P x .
  • each successive plane P x receives a blank 3 'which can be fixed, for example, by gluing.
  • the machining device 7 comprises abrasive means 13 which are rotatably mounted along a second axis A 2 and which are intended to machine each blank 3 '.
  • the abrasive means 13 are moved in the hollow of the drum 11 in the form of a ring.
  • the abrasive means 13 presented to the figure 1 are formed by a conventional grinding wheel, that is to say without any particular shape of its contact zone.
  • the abrasive means 13 may be different and, for example, take the form of a curved or conical shoe.
  • the machining device 7 comprises displacement means 15 of the second axis A 2 so that the latter is movably mounted in a curved director to selectively form a second curvature C 2 to each blank 3 '. It is therefore clear that the manufacturing system 1 makes it possible to form first and second curvatures C 1 , C 2 concave.
  • the displacement means 15 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 2 or, for example, a controller programmed to move along said second curvature.
  • the first curvature C 1 is generated perpendicularly to the axis A 1 by the radius extending between the axis A 1 and the contact zone between the abrasive means 13 and each blank 3 '. Because the drum 11 is rotated along the axis A 1 , each blank 3 'is thus transversely excavated along a single radius forming the first curvature C 1 concave.
  • each blank 3 ' is hollowed longitudinally along a curved director forming the second curvature C 2 concave.
  • the director curve of the displacement means 15 may be symmetrical or not to form the second curvature C 2 in one or more rays.
  • the director curve of the displacement means 15 may be symmetrical or not to form the second curvature C 2 in one or more rays.
  • first axis A 1 and the second axis A 2 are perpendicular in order to cross the machining lines. This feature advantageously facilitates the subsequent polishing of the trim pieces 3.
  • a polishing system 21 has been developed for parts of type 3 'illustrated in FIG. figure 4 , that is to say which has surfaces whose curvatures C 1 , C 2 are concave. As illustrated in figure 2 , the polishing system 21 comprising a fixing device 25 and a grinding device 27.
  • the grinding device 27 comprising abrasive means 33 rotatably mounted along an axis A 3 and intended to polish the part 3 'according to a first curvature C 1 .
  • the contact surface of the abrasive means 33 comprises a curved surface for polishing the piece 3 'according to a second curvature C 2 in addition to said first C 1 .
  • the abrasive means 33 presented to the figure 2 are preferably formed by a disc whose grinding surface comprises a convex surface, for example of metal, which is regularly coated with a polishing liquid.
  • the fixing device 25 comprises a support 31 which carries the piece 3 'to be polished.
  • the fixing device 25 further comprises means 35 for moving the support 31 so that it reciprocates along an axis A 4 .
  • the axis A 4 is substantially perpendicular to the axis A 3 of rotation of the abrasive means 33.
  • the displacement means 35 allow the blank 3 'of the piece 3 both to be pressed and to move in order to force the friction of the abrasive means 33 against each blank 3' for the purpose of selectively polishing them according to the second curvature C 2 . It is therefore clear that the polishing system 21 makes it possible to polish concave first and second curvatures C 1 , C 2 .
  • the displacement means 35 make it possible to press and move the blank 3 'of the part 3 with respect to the abrasive means 33.
  • the displacement means 35 will be better understood in relation with the Figures 5 to 8 .
  • the displacement means 35 are formed by a rotary actuator 32 driving a crank 34 substantially discoidal which is connected off-center to a rod 36 integral with the axis A 4 to form the desired movement B back and forth.
  • the connecting rod 36 in the example illustrated in Figures 5 to 8 comprises two shafts 37 and 38.
  • the shaft 37 thus connects the pin 39 of the crank 34, which is off-center with respect to the axis of the actuator 32, to the shaft 38.
  • the latter pivotally mounted according to FIG. A axis 4 connects the shaft 37 and the support 31.
  • An illustration of the movement B is shown in FIGS. Figures 6 to 8 .
  • the displacement means 35 can be seen in one of the extreme positions of the movement B.
  • the two shafts 37, 38 of the connecting rod 36 form an acute angle with respect to each other. It is therefore understood that when the crank 34 prints a rotation in the retrograde direction illustrated in FIG. figure 6 this causes a trigonometric rotation of the arm 38 and, incidentally, that of the support 31 relative to the axis A4.
  • the displacement means 35 can be seen in a substantially central position of the movement B. In this position, the two shafts 37, 38 of the connecting rod 36 form a substantially straight angle relative to each other. It is therefore understood that if the crank 34 continues its rotation in the retrograde direction illustrated in FIG. figure 7 this always causes a trigonometric rotation of the arm 38 and, incidentally, that of the support 31 relative to the axis A4.
  • the displacement means 35 are furthermore mounted on a set 41 of carriages selectively displaceable longitudinally C, transversely D and vertically E.
  • This thus makes it possible not only to finely position the support 31 with respect to the abrasive means 33 but also to obtain the desired veneer.
  • the longitudinal carriage is controlled according to a movement C greater than the interval between the blank 3 'of the piece 3 to be polished and the abrasive means 33.
  • polishing is performed piece by piece by plating the blank 3 'against the abrasive means 33, the back and forth movement of the support 31 forcing the blank 3' to follow the curved contact surface abrasive means 33.
  • the polishing is therefore performed by moving a blank 3 'piece by piece against abrasive means 33 rotatably mounted along a fixed axis A 3 which allows a very low scrap rate.
  • Pieces 3 may optionally also be subjected to a final step of chemical superpolishing to further improve their appearance.
  • abrasive means 33 may be different and, for example, take the form of a curved or conical shoe.
  • displacement means 35 may be of a different nature to obtain the same type of veneer and reciprocating motions.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Description

Domaine de l'inventionField of the invention

L'invention se rapporte à un système de polissage d'une pièce d'habillage pour une pièce d'horlogerie et notamment la surface concave d'une telle pièce.The invention relates to a system for polishing a trim piece for a timepiece and in particular the concave surface of such a piece.

Arrière plan de l'inventionBackground of the invention

Il est connu de former des glaces de montre en saphir qui sont très résistantes aux rayures. De telles glaces sont généralement fabriquées par la mise en contact d'une meule rotative contre la surface d'un tambour supportant plusieurs glaces. Le meulage résultant permet de former une glace cylindrique ou sphérique. Toutefois, il devient nécessaire de former des glaces asymétriques pour s'adapter par exemple à des affichages de pièce d'horlogerie qui ne sont pas centrés par rapport à son boîtier ce qui n'est pas possible à partir des techniques actuelles de fabrication en série.It is known to form sapphire watch glasses which are very resistant to scratching. Such ice creams are generally made by contacting a rotating grinding wheel against the surface of a drum supporting a plurality of windows. The resulting grinding makes it possible to form a cylindrical or spherical ice. However, it becomes necessary to form asymmetrical windows to adapt for example to timepiece displays that are not centered relative to its housing which is not possible from the current series of manufacturing techniques. .

Résumé de l'inventionSummary of the invention

Le but de la présente invention est de pallier tout ou partie les inconvénients cités précédemment en proposant un système de polissage pièce à pièce qui ne déforme pas les ébauches et permet un polissage amélioré de surfaces concaves complexes avec un très faible taux de rebut.The object of the present invention is to overcome all or part of the disadvantages mentioned above by proposing a piece-to-piece polishing system which does not deform the blanks and allows improved polishing of complex concave surfaces with a very low scrap rate.

A cet effet, l'invention se rapporte à un système de polissage d'une surface concave d'une pièce d'habillage pour une pièce d'horlogerie selon la revendication 1.For this purpose, the invention relates to a system for polishing a concave surface of a trim piece for a timepiece according to claim 1.

On comprend donc que le polissage s'effectue pièce à pièce par contact de la pièce contre les moyens abrasifs. Le mouvement de va-et-vient du support oblige alors la pièce à suivre la surface de contact courbe des moyens abrasifs. Le polissage est donc effectué par le déplacement des pièces une à une contre les moyens abrasifs monté à rotation selon un axe fixe ce qui autorise un très faible taux de rebut en évitant la dégradation de la surface concave ébauchée avant polissage.It is therefore understood that the polishing is carried out piece by piece by contact of the workpiece against the abrasive means. The back-and-forth movement of the support then forces the part to follow the curved contact surface of the abrasive means. The polishing is therefore performed by moving the pieces one by one against the abrasive means rotatably mounted along a fixed axis which allows a very low scrap rate by avoiding the degradation of the concave surface roughened before polishing.

Conformément à d'autres caractéristiques avantageuses de l'invention :

  • les moyens de déplacement sont formés par un actionneur rotatif entraînant une manivelle qui est reliée de manière décentrée à une bielle solidaire dudit deuxième axe afin de former ledit mouvement de va-et-vient ;
  • les moyens de déplacement sont montés sur un ensemble de chariots sélectivement déplaçables afin de forcer la pièce à polir à exercer une contrainte contre lesdits moyens abrasifs ;
  • ledit premier axe et ledit deuxième axe sont sensiblement perpendiculaires ;
  • les moyens abrasifs sont formés par une meule ;
  • la pièce est formée à partir d'alumine cristallisée.
According to other advantageous features of the invention:
  • the displacement means are formed by a rotary actuator driving a crank which is connected off-center to a connecting rod secured to said second axis to form said reciprocating movement;
  • the displacement means are mounted on a set of carriages selectively movable to force the workpiece to exert stress against said abrasive means;
  • said first axis and said second axis are substantially perpendicular;
  • the abrasive means are formed by a grinding wheel;
  • the piece is formed from crystallized alumina.

Description sommaire des dessinsBrief description of the drawings

D'autres particularités et avantages ressortiront clairement de la description qui en est faite ci-après, à titre indicatif et nullement limitatif, en référence aux dessins annexés, dans lesquels :

  • la figure 1 est une vue d'un système d'usinage d'ébauches selon l'invention ;
  • la figure 2 est une vue schématique d'un système de polissage selon l'invention ;
  • les figures 3 et 4 sont des représentations d'une ébauche à deux étapes différentes de fabrication ;
  • la figure 5 est une représentation schématique des moyens de déplacement du dispositif de fixation selon l'invention ;
  • les figures 6 à 8 sont des représentations vues de dessus des moyens de déplacement du dispositif de fixation à différentes phases de leur déplacement.
Other particularities and advantages will emerge clearly from the description which is given hereinafter, by way of indication and in no way limiting, with reference to the appended drawings, in which:
  • the figure 1 is a view of a blank machining system according to the invention;
  • the figure 2 is a schematic view of a polishing system according to the invention;
  • the Figures 3 and 4 are representations of a blank at two different stages of manufacture;
  • the figure 5 is a schematic representation of the displacement means of the fixing device according to the invention;
  • the Figures 6 to 8 are representations seen from above of the means of displacement of the fixing device at different phases of their displacement.

Description détaillée des modes de réalisation préférésDetailed Description of the Preferred Embodiments

L'invention se rapporte à une pièce d'habillage d'une pièce d'horlogerie comme une glace, un boîtier ou un cadran à base d'alumine cristallisée comme du saphir, du corindon ou du rubis. L'invention se rapporte à de nouveaux systèmes de fabrication destinés à ébaucher puis polir de telles pièces de forme complexe. Bien entendu, même si la présente invention a été développée pour le domaine de l'horlogerie, elle ne saurait s'y limiter. D'autres applications sont également envisageables comme dans l'optique, les arts de la table ou l'électronique.The invention relates to a piece of clothing of a timepiece such as an ice, a case or a dial based on crystallized alumina such as sapphire, corundum or ruby. The invention relates to new manufacturing systems for roughing and polishing such pieces of complex shape. Of course, even if the present invention has been developed for the field of watchmaking, it can not be limited thereto. Other applications are also conceivable, such as optics, tableware or electronics.

Comme illustré à la figure 1, un système de fabrication 1 a été développé afin de réaliser des pièces 3 d'habillage comportant des surfaces dont les courbures C1, C2 sont concaves. Le système de fabrication 1 comporte un dispositif de fixation 5 et un dispositif d'usinage 7.As illustrated in figure 1 , a manufacturing system 1 has been developed in order to produce trim parts 3 comprising surfaces whose curvatures C 1 , C 2 are concave. The manufacturing system 1 comprises a fixing device 5 and a machining device 7.

Le dispositif de fixation 5 comprend un tambour 11 monté à rotation selon un premier axe A1 et portant au moins une ébauche 3' de la future pièce 3. Préférentiellement, comme visible à la figure 1, le tambour 11 est un anneau comportant une paroi interne facettée, c'est-à-dire munie de plans Px successifs. Comme illustré à la figure 1, chaque plan Px successif reçoit une ébauche 3' qui peut être fixée, par exemple, par collage.The fixing device 5 comprises a drum 11 rotatably mounted along a first axis A 1 and carrying at least one blank 3 'of the future part 3. Preferably, as visible in FIG. figure 1 , the drum 11 is a ring having a faceted internal wall, that is to say provided with successive planes P x . As illustrated in figure 1 each successive plane P x receives a blank 3 'which can be fixed, for example, by gluing.

Le dispositif d'usinage 7 comporte des moyens abrasifs 13 qui sont montés à rotation selon un deuxième axe A2 et qui sont destinés à usiner chaque ébauche 3'. Préférentiellement, les moyens abrasifs 13 sont déplacés dans le creux du tambour 11 en forme d'anneau. Les moyens abrasifs 13 présentés à la figure 1 sont formés par une meule classique, c'est-à-dire sans forme particulière de sa zone de contact. Bien entendu, les moyens abrasifs 13 peuvent être différents et, par exemple, prendre la forme d'un sabot courbe ou conique.The machining device 7 comprises abrasive means 13 which are rotatably mounted along a second axis A 2 and which are intended to machine each blank 3 '. Preferably, the abrasive means 13 are moved in the hollow of the drum 11 in the form of a ring. The abrasive means 13 presented to the figure 1 are formed by a conventional grinding wheel, that is to say without any particular shape of its contact zone. Of course, the abrasive means 13 may be different and, for example, take the form of a curved or conical shoe.

Avantageusement selon l'invention, le dispositif d'usinage 7 comporte des moyens de déplacement 15 du deuxième axe A2 afin que ce dernier soit monté mobile selon une directrice courbe pour former sélectivement une deuxième courbure C2 à chaque ébauche 3'. On comprend donc que le système de fabrication 1 permet de former des première et deuxième courbures C1, C2 concaves.Advantageously according to the invention, the machining device 7 comprises displacement means 15 of the second axis A 2 so that the latter is movably mounted in a curved director to selectively form a second curvature C 2 to each blank 3 '. It is therefore clear that the manufacturing system 1 makes it possible to form first and second curvatures C 1 , C 2 concave.

Selon l'invention, les moyens de déplacement 15 peuvent être, de manière non limitative, formés par un actionneur déplacé en va-et-vient contre le profil d'une came fixe correspondant à la deuxième courbure C2 ou, par exemple, un automate programmé pour se déplacer selon ladite deuxième courbure.According to the invention, the displacement means 15 may be, without limitation, formed by an actuator moved back and forth against the profile of a fixed cam corresponding to the second curvature C 2 or, for example, a controller programmed to move along said second curvature.

Ainsi, la première courbure C1 est générée perpendiculairement à l'axe A1 par le rayon s'étendant entre l'axe A1 et la zone de contact entre les moyens abrasifs 13 et chaque ébauche 3'. Du fait que le tambour 11 est déplacé à rotation selon l'axe A1, chaque ébauche 3' est donc creusée transversalement selon un rayon unique formant la première courbure C1 concave.Thus, the first curvature C 1 is generated perpendicularly to the axis A 1 by the radius extending between the axis A 1 and the contact zone between the abrasive means 13 and each blank 3 '. Because the drum 11 is rotated along the axis A 1 , each blank 3 'is thus transversely excavated along a single radius forming the first curvature C 1 concave.

De plus, la deuxième courbure C2 est directement obtenue par le déplacement sélectif du deuxième axe A2. Ainsi, pendant que la première courbure C1 est générée, la zone de contact entre les moyens abrasifs 13 et chaque ébauche 3' est progressivement déplacée par rapport à l'épaisseur du tambour 11 en forme d'anneau. Par conséquent, chaque ébauche 3' est creusée longitudinalement selon une directrice courbe formant la deuxième courbure C2 concave.In addition, the second curvature C 2 is directly obtained by the selective displacement of the second axis A 2 . Thus, while the first curvature C 1 is generated, the contact area between the abrasive means 13 and each blank 3 'is progressively displaced with respect to the thickness of the ring-shaped drum 11. Therefore, each blank 3 'is hollowed longitudinally along a curved director forming the second curvature C 2 concave.

On comprend donc immédiatement que la directrice courbe des moyens de déplacement 15 peut être symétrique ou non afin de former la deuxième courbure C2 selon un ou plusieurs rayons. A titre d'exemple, il est possible de partir d'une ébauche 3" comportant une face supérieure 12 et une face supérieure 14 représentée à la figure 3. Après sa modification par le système de fabrication 1, l'ébauche résultante 3' peut alors comporter une de ces faces 12, 14 avec une surface concave transversale comprenant une courbure C1 et une surface concave longitudinale comprenant une courbure C2.It is therefore immediately understood that the director curve of the displacement means 15 may be symmetrical or not to form the second curvature C 2 in one or more rays. By way of example, it is possible to start from a blank 3 "having an upper face 12 and an upper face 14 shown in FIG. figure 3 . After its modification by the manufacturing system 1, the resulting blank 3 'may then comprise one of these faces 12, 14 with a transverse concave surface comprising a curvature C 1 and a longitudinal concave surface comprising a curvature C 2 .

Enfin, préférentiellement selon l'invention, le premier axe A1 et le deuxième axe A2 sont perpendiculaires afin de croiser les raies d'usinage. Cette caractéristique permet avantageusement de faciliter le polissage postérieur des pièces d'habillage 3.Finally, preferentially according to the invention, the first axis A 1 and the second axis A 2 are perpendicular in order to cross the machining lines. This feature advantageously facilitates the subsequent polishing of the trim pieces 3.

Le polissage d'une surface concave comme celle formée à partir des courbures C1 et C2 a été tenté avec un outillage proche du système de système de fabrication 1, c'est-à-dire en remplaçant principalement le type de moyens abrasifs. Toutefois, cette tentative n'a pas donné satisfaction car le polissage d'un tel type induisait une déformation des courbures C1, C2 notamment au niveau des bords des ébauches 3' à polir et, par conséquent, générait un taux de rebut trop élevé.The polishing of a concave surface such as that formed from the curvatures C 1 and C 2 was attempted with a tool close to the manufacturing system system 1, that is to say by replacing mainly the type of abrasive means. However, this attempt was unsatisfactory because the polishing of such a type induces a deformation of the curvatures C 1 , C 2 especially at the edges of the blanks 3 'to be polished and, consequently, generated a scrap rate too Student.

Par conséquent, un système de polissage 21 a été développé pour des pièces du type 3' illustrée à la figure 4, c'est-à-dire qui comporte des surfaces dont les courbures C1, C2 sont concaves. Comme illustré à la figure 2, le système de polissage 21 comportant un dispositif de fixation 25 et un dispositif de meulage 27.Therefore, a polishing system 21 has been developed for parts of type 3 'illustrated in FIG. figure 4 , that is to say which has surfaces whose curvatures C 1 , C 2 are concave. As illustrated in figure 2 , the polishing system 21 comprising a fixing device 25 and a grinding device 27.

Le dispositif de meulage 27 comportant des moyens abrasifs 33 montés à rotation selon un axe A3 et destinés à polir la pièce 3' selon une première courbure C1. Préférentiellement selon l'invention, la surface de contact des moyens abrasifs 33 comporte surface courbe pour polir la pièce 3' selon une deuxième courbure C2 en plus de ladite première C1. Les moyens abrasifs 33 présentés à la figure 2 sont, de manière préférée, formés par un disque dont la surface de meulage comporte une surface convexe, par exemple en métal, qui est régulièrement enduite d'un liquide de polissage.The grinding device 27 comprising abrasive means 33 rotatably mounted along an axis A 3 and intended to polish the part 3 'according to a first curvature C 1 . Preferably according to the invention, the contact surface of the abrasive means 33 comprises a curved surface for polishing the piece 3 'according to a second curvature C 2 in addition to said first C 1 . The abrasive means 33 presented to the figure 2 are preferably formed by a disc whose grinding surface comprises a convex surface, for example of metal, which is regularly coated with a polishing liquid.

Le dispositif de fixation 25 comprend un support 31 qui porte la pièce 3' à polir. Préférentiellement selon l'invention, le dispositif de fixation 25 comporte en outre des moyens de déplacement 35 du support 31 afin qu'il imprime un mouvement de va-et-vient selon un axe A4. On remarque à la figure 2 que l'axe A4 est sensiblement perpendiculairement par rapport à l'axe A3 de rotation des moyens abrasifs 33.The fixing device 25 comprises a support 31 which carries the piece 3 'to be polished. Preferably according to the invention, the fixing device 25 further comprises means 35 for moving the support 31 so that it reciprocates along an axis A 4 . We notice at the figure 2 that the axis A 4 is substantially perpendicular to the axis A 3 of rotation of the abrasive means 33.

Ainsi, les moyens de déplacement 35 permettent à l'ébauche 3' de la pièce 3 à la fois d'être plaquée et de se déplacer afin de forcer le frottement des moyens abrasifs 33 contre chaque ébauche 3' dans le but de les polir sélectivement selon la deuxième courbure C2. On comprend donc que le système de polissage 21 permet de polir des première et deuxième courbures C1, C2 concaves.Thus, the displacement means 35 allow the blank 3 'of the piece 3 both to be pressed and to move in order to force the friction of the abrasive means 33 against each blank 3' for the purpose of selectively polishing them according to the second curvature C 2 . It is therefore clear that the polishing system 21 makes it possible to polish concave first and second curvatures C 1 , C 2 .

Selon l'invention, les moyens de déplacement 35 permettent de plaquer et de déplacer l'ébauche 3' de la pièce 3 par rapport aux moyens abrasifs 33. Les moyens de déplacement 35 seront mieux compris en relation avec les figures 5 à 8.According to the invention, the displacement means 35 make it possible to press and move the blank 3 'of the part 3 with respect to the abrasive means 33. The displacement means 35 will be better understood in relation with the Figures 5 to 8 .

Préférentiellement selon l'invention, les moyens de déplacement 35 sont formés par un actionneur rotatif 32 entraînant une manivelle 34 sensiblement discoïdale qui est reliée de manière décentrée à une bielle 36 solidaire de l'axe A4 afin de former le mouvement B de va-et-vient souhaité.Preferably, according to the invention, the displacement means 35 are formed by a rotary actuator 32 driving a crank 34 substantially discoidal which is connected off-center to a rod 36 integral with the axis A 4 to form the desired movement B back and forth.

La bielle 36 dans l'exemple illustré aux figures 5 à 8 comporte deux arbres 37 et 38. L'arbre 37 relie ainsi le tenon 39 de la manivelle 34, qui est décentré par rapport à l'axe de l'actionneur 32, à l'arbre 38. Ce dernier, monté en pivotement selon l'axe A4, relie l'arbre 37 et le support 31. Une illustration du mouvement B est montrée aux figures 6 à 8.The connecting rod 36 in the example illustrated in Figures 5 to 8 comprises two shafts 37 and 38. The shaft 37 thus connects the pin 39 of the crank 34, which is off-center with respect to the axis of the actuator 32, to the shaft 38. The latter, pivotally mounted according to FIG. A axis 4 connects the shaft 37 and the support 31. An illustration of the movement B is shown in FIGS. Figures 6 to 8 .

A la figure 6, on peut voir les moyens de déplacement 35 dans une des positions extrêmes du mouvement B. Dans cette première position extrême, les deux arbres 37, 38 de la bielle 36 forme un angle aigu l'un par rapport à l'autre. On comprend donc que quand la manivelle 34 imprime une rotation dans le sens rétrograde illustrée à la figure 6, cela entraîne une rotation trigonométrique du bras 38 et, incidemment, celle du support 31 par rapport à l'axe A4.To the figure 6 the displacement means 35 can be seen in one of the extreme positions of the movement B. In this first extreme position, the two shafts 37, 38 of the connecting rod 36 form an acute angle with respect to each other. It is therefore understood that when the crank 34 prints a rotation in the retrograde direction illustrated in FIG. figure 6 this causes a trigonometric rotation of the arm 38 and, incidentally, that of the support 31 relative to the axis A4.

A la figure 7, on peut voir les moyens de déplacement 35 dans une position sensiblement centrale du mouvement B. Dans cette position, les deux arbres 37, 38 de la bielle 36 forme un angle sensiblement droit l'un par rapport à l'autre. On comprend donc que si la manivelle 34 continue sa rotation dans le sens rétrograde illustrée à la figure 7, cela entraîne toujours une rotation trigonométrique du bras 38 et, incidemment, celle du support 31 par rapport à l'axe A4.To the figure 7 the displacement means 35 can be seen in a substantially central position of the movement B. In this position, the two shafts 37, 38 of the connecting rod 36 form a substantially straight angle relative to each other. It is therefore understood that if the crank 34 continues its rotation in the retrograde direction illustrated in FIG. figure 7 this always causes a trigonometric rotation of the arm 38 and, incidentally, that of the support 31 relative to the axis A4.

A la figure 8, on peut voir les moyens de déplacement 35 dans leur deuxième position extrême du mouvement B. Dans cette deuxième position extrême, les deux arbres 37, 38 de la bielle 36 forme un angle obtus l'un par rapport à l'autre. On comprend donc que quand la manivelle 34 imprime une rotation dans le sens rétrograde illustrée à la figure 8, cela entraîne une rotation rétrograde du bras 38 et, incidemment, celle du support 31 par rapport à l'axe A4 jusqu'au retour à la première position extrême en passant par la même position sensiblement centrale.To the figure 8 the displacement means 35 in their second extreme position of the movement B can be seen. In this second extreme position, the two shafts 37, 38 of the connecting rod 36 form an obtuse angle with respect to each other. It is therefore understood that when the crank 34 prints a rotation in the retrograde direction illustrated in FIG. figure 8 this causes a retrograde rotation of the arm 38 and, incidentally, that of the support 31 relative to the axis A4 until the return to the first extreme position through the same substantially central position.

Par conséquent, le mouvement rotatif de l'actionneur 32 est transformé par l'ensemble manivelle 34 - bielle 36 en un mouvement de va-et-vient du support 31.Consequently, the rotary movement of the actuator 32 is transformed by the crank assembly 34 - connecting rod 36 into a back and forth movement of the support 31.

Préférentiellement selon l'invention, les moyens de déplacement 35 sont en outre montés sur un ensemble 41 de chariots sélectivement déplaçables longitudinalement C, transversalement D et verticalement E. Cela permet ainsi non seulement de placer finement le support 31 par rapport aux moyens abrasifs 33 mais également d'obtenir le placage souhaité. En effet, afin de forcer la pièce à polir via le support 31 à exercer une contrainte contre les moyens abrasifs 33, le chariot longitudinal est commandé selon un mouvement C supérieur à l'intervalle entre l'ébauche 3' de la pièce 3 à polir et les moyens abrasifs 33.Preferably, according to the invention, the displacement means 35 are furthermore mounted on a set 41 of carriages selectively displaceable longitudinally C, transversely D and vertically E. This thus makes it possible not only to finely position the support 31 with respect to the abrasive means 33 but also to obtain the desired veneer. Indeed, in order to force the piece to be polished via the support 31 to exert a stress against the abrasive means 33, the longitudinal carriage is controlled according to a movement C greater than the interval between the blank 3 'of the piece 3 to be polished and the abrasive means 33.

On comprend donc que le polissage s'effectue pièce à pièce par placage de l'ébauche 3' contre les moyens abrasifs 33, le mouvement de va-et-vient du support 31 obligeant l'ébauche 3' à suivre la surface de contact courbe des moyens abrasifs 33. Le polissage est donc effectué par le déplacement d'une ébauche 3' pièce à pièce contre des moyens abrasifs 33 monté à rotation selon un axe A3 fixe ce qui autorise un très faible taux de rebut.It is therefore understood that the polishing is performed piece by piece by plating the blank 3 'against the abrasive means 33, the back and forth movement of the support 31 forcing the blank 3' to follow the curved contact surface abrasive means 33. The polishing is therefore performed by moving a blank 3 'piece by piece against abrasive means 33 rotatably mounted along a fixed axis A 3 which allows a very low scrap rate.

La pièce 3, obtenue après la modification de l'ébauche 3' par le système de polissage 21, comporte donc une de ces faces 12, 14 avec une surface concave transversale comprenant une courbure C1 et une surface concave longitudinale comprenant une courbure C2 qui sont parfaitement polies. Les pièces 3 peuvent éventuellement également être soumises à une étape finale de superpolissage chimique pour améliorer encore leur aspect.The piece 3, obtained after the modification of the blank 3 'by the polishing system 21, thus comprises one of these faces 12, 14 with a transverse concave surface comprising a curvature C 1 and a longitudinal concave surface comprising a curvature C 2 which are perfectly polished. Pieces 3 may optionally also be subjected to a final step of chemical superpolishing to further improve their appearance.

Bien entendu, la présente invention ne se limite pas à l'exemple illustré mais est susceptible de diverses variantes et modifications qui apparaîtront à l'homme de l'art. En particulier, les moyens abrasifs 33 peuvent être différents et, par exemple, prendre la forme d'un sabot courbe ou conique.Of course, the present invention is not limited to the illustrated example but is susceptible of various variations and modifications that will occur to those skilled in the art. In particular, the abrasive means 33 may be different and, for example, take the form of a curved or conical shoe.

Il est également convenu que les moyens de déplacement 35 peuvent être de nature différente pour obtenir le même type de placage et de mouvements B de va-et-vient.It is also agreed that the displacement means 35 may be of a different nature to obtain the same type of veneer and reciprocating motions.

Claims (9)

  1. System (21) of polishing a concave surface of an external piece (3) for a timepiece comprising a securing device (25) including a support (31) which carries said piece, a grinding device (27) including an abrasive means (33) formed by a disc which is rotatably mounted along a first axis (A3) so as to polish said piece along a first curvature (C1), the securing device (25) further including moving means (35) of the support (31) and the contact surface of the abrasive means (33) formed on the peripheral wall of said disc is curved to polish said piece along a second curvature (C2) in addition to said first curvature characterised in that the support carries only said piece and in that moving means are arranged so that the support (31) imparts a back-and-forth motion (B) relative to a second axis (A4).
  2. System (21) according to the preceding claim, characterized in that the moving means (35) is formed by a rotating actuator (32) driving a crank-shaft (34) which is connected off-centre to a connecting rod (36) integral with said second axis in order to form said back-and-forth motion.
  3. System (21) according to claim 1 or 2, characterized in that the moving means (35) is mounted on a set (41) of selectively moveable carriages (C, D, E) in order to force the piece (3) to be polished to exert a a force (C) against said abrasive means.
  4. System (21) according to any of the preceding claims, characterized in that said first axis (A3) and said second axis (A4) are substantially perpendicular.
  5. System (21) according to any of the preceding claims, characterized in that the abrasive means (33) is formed by a grinding wheel.
  6. System (21) according to any of the preceding claims, characterized in that the first curvature (C1) is a single concave radius.
  7. System (21) according to any of the preceding claims, characterized in that the second curvature (C2) is a symmetrical concave curvature.
  8. System (21) according to any of claims 1 to 6, characterized in that the second curvature (C2) is a non-symmetrical concave curvature.
  9. System (21) according to the preceding claim, characterized in that the second curvature (C2) is formed by several concave radii.
EP12704793.4A 2011-03-16 2012-02-17 Polishing system for a piece of a watchcase Active EP2686134B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12704793.4A EP2686134B1 (en) 2011-03-16 2012-02-17 Polishing system for a piece of a watchcase

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP11158458A EP2500135A1 (en) 2011-03-16 2011-03-16 System for polishing a cover part for a timepiece
EP12704793.4A EP2686134B1 (en) 2011-03-16 2012-02-17 Polishing system for a piece of a watchcase
PCT/EP2012/052743 WO2012123215A1 (en) 2011-03-16 2012-02-17 System for polishing an exterior part for a timepiece

Publications (2)

Publication Number Publication Date
EP2686134A1 EP2686134A1 (en) 2014-01-22
EP2686134B1 true EP2686134B1 (en) 2014-10-22

Family

ID=44227484

Family Applications (2)

Application Number Title Priority Date Filing Date
EP11158458A Withdrawn EP2500135A1 (en) 2011-03-16 2011-03-16 System for polishing a cover part for a timepiece
EP12704793.4A Active EP2686134B1 (en) 2011-03-16 2012-02-17 Polishing system for a piece of a watchcase

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP11158458A Withdrawn EP2500135A1 (en) 2011-03-16 2011-03-16 System for polishing a cover part for a timepiece

Country Status (6)

Country Link
US (1) US9914195B2 (en)
EP (2) EP2500135A1 (en)
JP (1) JP5959544B2 (en)
CN (1) CN103442847B (en)
RU (1) RU2590515C2 (en)
WO (1) WO2012123215A1 (en)

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747339A (en) * 1954-01-18 1956-05-29 Bausch & Lomb Lens grinding machine
FR1233568A (en) * 1959-04-07 1960-10-12 Comm Ouvriers Lunetiers Soc In Sweetening machine
SU368012A1 (en) * 1969-03-28 1973-01-26 DEVICE FOR PROCESSING SURFACES OF OPTICAL PARTS
SU528181A1 (en) * 1973-07-06 1976-09-15 Предприятие П/Я Г-4671 The method of processing aspherical surfaces
US4038783A (en) * 1976-09-03 1977-08-02 Leon Rosenthal Method and apparatus for generating optic lenses
DD135586A1 (en) * 1977-11-10 1979-05-16 Juergen Loewinger GRINDING MACHINE, ESPECIALLY FOR THE PRODUCTION OF TORICAL LENSES
US4510717A (en) * 1982-12-16 1985-04-16 Coburn Optical Industries, Inc. Lens finishing apparatus
JPS60242948A (en) * 1984-05-17 1985-12-02 Matsushita Electric Ind Co Ltd Bevelling method
US5720649A (en) * 1995-12-22 1998-02-24 Gerber Optical, Inc. Optical lens or lap blank surfacing machine, related method and cutting tool for use therewith
CH690873A5 (en) * 1996-10-04 2001-02-15 Stettler Hans Ag Ice shows.
CN2278561Y (en) * 1997-03-14 1998-04-15 王斌武 Wheel type inscattering lens fine grinding polishing machine
RU2127182C1 (en) * 1998-02-11 1999-03-10 Государственное научно-производственное объединение "Оптика" Method for manufacturing of optical lenses
CN2365011Y (en) * 1999-05-05 2000-02-23 胡秀 Fine grinding polishing machine
EP1894672B1 (en) * 2002-01-09 2012-05-02 Hoya Corporation Polishing method
EP1645919B1 (en) * 2004-10-11 2007-12-19 Fuji Crystal Manufactory Ltd. Cambered watch crystal
EP2228694A1 (en) * 2009-03-12 2010-09-15 Stettler Sapphire AG Method and device for grinding watch glasses

Also Published As

Publication number Publication date
CN103442847B (en) 2017-02-08
EP2500135A1 (en) 2012-09-19
US9914195B2 (en) 2018-03-13
CN103442847A (en) 2013-12-11
RU2013146017A (en) 2015-04-27
JP5959544B2 (en) 2016-08-02
JP2014512975A (en) 2014-05-29
US20140004777A1 (en) 2014-01-02
RU2590515C2 (en) 2016-07-10
WO2012123215A1 (en) 2012-09-20
EP2686134A1 (en) 2014-01-22

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