EP0329651B1 - Polishing disk of fibrous material and process for utilizing same - Google Patents
Polishing disk of fibrous material and process for utilizing same Download PDFInfo
- Publication number
- EP0329651B1 EP0329651B1 EP87904018A EP87904018A EP0329651B1 EP 0329651 B1 EP0329651 B1 EP 0329651B1 EP 87904018 A EP87904018 A EP 87904018A EP 87904018 A EP87904018 A EP 87904018A EP 0329651 B1 EP0329651 B1 EP 0329651B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- disk
- slots
- periphery
- radial direction
- fibrous material
- 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.)
- Expired - Lifetime
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Classifications
-
- 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
- G04D3/02—Lathes, with one or more supports; Burnishing machines, with one or more supports
- G04D3/0227—Lathes, with one or more supports; Burnishing machines, with one or more supports for the manufacture of special components for clockworks
- G04D3/029—Lathes, with one or more supports; Burnishing machines, with one or more supports for the manufacture of special components for clockworks for components of the means protecting the mechanism from external influences, e.g. cases
Definitions
- the first object of the present invention is a disc made of fibrous material for polishing metal parts, in particular parts of watch cases.
- polishing operations play an essential role in the termination of certain metal parts, such as certain parts of watch cases, in particular parts made of a precious metal.
- the required degree of polishing must be obtained in a perfectly regular manner over the entire surface of the part, and this as quickly as possible and without deformation of the part.
- these requirements are particularly difficult to meet if the surfaces to be polished are complicated, such as for example the connection surfaces between the outer periphery of a middle part or of a case body and a hinge or a strap fixing horn.
- US-A-2,146,548 describes abrasive wheels formed by a stack of fabric discs covered with abrasive material on their external face of the kind mentioned in the preamble of claim 1. Radial or oblique slots are provided. They all extend to the same depth.
- the different elements are separated from each other at their periphery or retained by a central means.
- the disc of the invention is characterized in that it forms a solid piece of said material and in that its periphery is cut into contiguous strips separated by thin slots, which have at all points of their length a direction oblique to the radial direction and which extend over varying depths so as to determine lamellae whose thickness remains approximately constant as a function of the depth.
- the subject of the invention is also a method of polishing a metal part, in particular a watch case part, characterized in that a disc of the aforementioned type is used, the periphery of which is cut into contiguous strips separated by thin slits having, at all points along their length, an oblique direction with respect to the radial direction, and this disc is rotated at a sufficient speed so that, under the effect of centrifugal force, the lamellae are compressed l 'against the other at the periphery of the disc.
- the polishing disc shown in fig. 1 is a massive, relatively hard felt disc with a diameter of around 30 cm.
- the thickness of the disc is of the order of 10 mm.
- This disc 1 has at its periphery a series of thin slots of different lengths.
- the slots designated by 2 extend to a circle 3 whose diameter is approximately half the total diameter of the disc, while the slots designated by 4 which are interposed between the slots 2 extend in depth to a circle 5 of intermediate diameter between the periphery of the disc 1 and of the circle 3.
- these different slots determine branched lamellae whose thickness varies relatively little as a function of the depth.
- the slots can be cut in a straight line.
- the number and therefore the thickness of the slats is not critical. In the embodiment described (diameter 30 cm) the number was, at the periphery of the disc, of 90. However, according to the needs this number can be modified.
- the optimum angle of inclination of the slots depends on the application cases. It has been found that in some cases a value of 20 ° is advantageous, but this value is not limiting. It will also be noted that the angle of inclination of the slots could also be reversed with respect to the direction of rotation, from the example in FIG. 1.
- the latter For carrying out a polishing operation by means of the disc 1, the latter is mounted so as to be driven in rotation in the direction of the arrow 7 in FIG. 1, at a speed such that under the effect of centrifugal force the various lamellae separated by the slots 2 and 4 are compressed against each other.
- the resistance force is relatively high, while, if the application force is directed obliquely to the plane of the disc, the lamellae can easily deform laterally. This prevents wear of the part if it is a piece of soft metal, for example gold.
- Fig. 3 schematically represents a type of middle designated by 8 comprising two hinges 9 of which all the outer surfaces are rounded in the manner of a rod. It has been found that on this type of middle, the rounded edges, in particular in the connection surfaces between the rod and the hinges, could be performed very quickly and easily without risk of wear of the part when using a disc 1 driven at the appropriate speed.
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Treatment Of Fiber Materials (AREA)
- Absorbent Articles And Supports Therefor (AREA)
Abstract
Description
Le premier objet de la présente invention est un disque en matière fibreuse pour le polissage de pièces métalliques notamment de pièces de boîtes de montre.The first object of the present invention is a disc made of fibrous material for polishing metal parts, in particular parts of watch cases.
On sait que les opérations de polissage jouent un rôle essentiel dans la terminaison de certaines pièces métalliques, comme certaines pièces de boîtes de montre, notamment des pièces en un métal précieux. Le degré de polissage requis doit être obtenu d'une façon parfaitement régulière sur toute la surface de la pièce, et cela aussi rapidement que possible et sans déformation de la pièce. Or, ces exigences sont particulièrement difficiles à respecter si les surfaces à polir sont compliquées, comme par exemple les surfaces de raccordement entre la périphérie extérieure d'une carrure ou d'un corps de boîte et un gond ou une corne de fixation du bracelet.It is known that polishing operations play an essential role in the termination of certain metal parts, such as certain parts of watch cases, in particular parts made of a precious metal. The required degree of polishing must be obtained in a perfectly regular manner over the entire surface of the part, and this as quickly as possible and without deformation of the part. However, these requirements are particularly difficult to meet if the surfaces to be polished are complicated, such as for example the connection surfaces between the outer periphery of a middle part or of a case body and a hinge or a strap fixing horn.
Il est connu d'utiliser pour ces opérations des disques circulaires d'épaisseur constante, en feutre, qui sont entrainés à une vitesse prédéterminée et contre lesquels les pièces à polir sont appliquées. Or, on a découvert qu'il était possible, grâce à une conformation spéciale de ces disques en feutre, de réaliser l'opération de polissage beaucoup plus rapidement que par le passé et en diminuant les risques de déformation des pièces, surtout lorsqu'il s'agit de pièces tendres, et la présente invention a pour but de réaliser ce perfectionnement.It is known to use for these operations circular discs of constant thickness, made of felt, which are driven at a predetermined speed and against which the parts to be polished are applied. However, we have discovered that it was possible, thanks to a special conformation of these felt discs, to carry out the polishing operation much faster than in the past and by reducing the risks of deformation of the parts, especially when these are soft parts, and the present invention aims to achieve this improvement.
On sait qu'il existe des meules formées d'une série d'éléments profilés rigides, montés radialement autour d'un moyeu. Il existe également des brosses et des meules formées d'éléments filiformes fixés par leurs racines autour d'un moyeu et s'étendant radialement vers l'extérieur.We know that there are grinding wheels formed of a series of rigid profiled elements, mounted radially around a hub. There are also brushes and grinders formed of filiform elements fixed by their roots around a hub and extending radially outwards.
Le brevet US-A-2 146 548 décrit des roues abrasives formées d'un empilage de disque de tissu recouverts de matière abrasive sur leur face externe du genre mentionné dans le préambule de la revendication 1. Des fentes radiales ou obliques sont prévues. Elles s'étendent toutes à la même profondeur.US-A-2,146,548 describes abrasive wheels formed by a stack of fabric discs covered with abrasive material on their external face of the kind mentioned in the preamble of
Dans toutes ces réalisations, les différents éléments sont séparés les uns des autres à leur périphérie ou retenus par un moyen central. Ce sont des constructions complexes et elles ne permettent pas d'obtenir le résultat que permet d'obtenir la présente invention.In all these embodiments, the different elements are separated from each other at their periphery or retained by a central means. These are complex constructions and they do not make it possible to obtain the result which the present invention achieves.
Dans le but indiqué, le disque de l'invention est caractérisé en ce qu'il forme une pièce massive de la dite matière et en ce que sa périphérie est découpée en lamelles jointives séparées par des fentes minces, qui ont en tout point de leur longueur une direction oblique par rapport à la direction radiale et qui s'étendent sur des profondeurs variables de manière à déterminer des lamelles dont l'épaisseur reste approximativement constante en fonction de la profondeur.For the purpose indicated, the disc of the invention is characterized in that it forms a solid piece of said material and in that its periphery is cut into contiguous strips separated by thin slots, which have at all points of their length a direction oblique to the radial direction and which extend over varying depths so as to determine lamellae whose thickness remains approximately constant as a function of the depth.
L'invention a également pour objet un procédé de polissage d'une pièce métallique, notamment d'une pièce de boîte de montre, caractérisé en ce qu'on utilise un disque du genre susmentionné, dont la périphérie est découpée en lamelles jointives séparées par des fentes minces ayant, en tous les points de leur longueur, une direction oblique par rapport à la direction radiale, et on fait tourner ce disque à une vitesse suffisante pour que, sous l'effet de la force centrifuge, les lamelles soient comprimées l'une contre l'autre à la périphérie du disque.The subject of the invention is also a method of polishing a metal part, in particular a watch case part, characterized in that a disc of the aforementioned type is used, the periphery of which is cut into contiguous strips separated by thin slits having, at all points along their length, an oblique direction with respect to the radial direction, and this disc is rotated at a sufficient speed so that, under the effect of centrifugal force, the lamellae are compressed l 'against the other at the periphery of the disc.
On va décrire ci-après à titre d'exemple une forme de mise en oeuvre de l'invention, en se référant au dessin annexé, dont:
- la fig. 1 est une vue en plan à petite échelle d'une forme d'exécution du disque en feutre,
- la fig. 2 une vue en perspective arrachée à plus grande échelle montrant une partie de la périphérie du disque, et
- la fig. 3 une vue en perspective coupée d'une carrure de boîte de montre polie au moyen du disque des fig. 1 et 2.
- fig. 1 is a plan view on a small scale of an embodiment of the felt disc,
- fig. 2 a perspective view torn off on a larger scale showing part of the periphery of the disc, and
- fig. 3 a perspective view cut from a watch case middle polished by means of the disc of fig. 1 and 2.
Le disque de polissage représenté à la fig. 1 est un disque massif en feutre relativement dur d'un diamètre de l'ordre de 30 cm. L'épaisseur du disque est de l'ordre de 10 mm. Ce disque 1 présente à sa périphérie une série de fentes minces de différentes longueurs. Les fentes désignées par 2 s'étendent jusqu'à un cercle 3 dont le diamètre est approximativement la moitié du diamètre total du disque, tandis que les fentes désignées par 4 qui sont intercalées entre les fentes 2 s'étendent en profondeur jusqu'à un cercle 5 de diamètre intermédiaire entre la périphérie du disque 1 et du cercle 3. Ainsi, ces différentes fentes déterminent des lamelles ramifiées dont l'épaisseur varie relativement peu en fonction de la profondeur. Sur la face du disque visible à la fig. 1, on voit que la moitié des fentes 2 se prolonge vers l'intérieur par des marques 6 qui permettent, le moment voulu, de prolonger les fentes 2 ainsi marquées de façon à poursuivre l'utilisation du disque lorsque la matière comprise entre le cercle extérieur et le cercle 3 a été entièrement usée. La disposition ainsi obtenue est mieux visible à la fig. 2 où l'on voit, que du fait du taillage des fentes 2 et 4, le feutre a tendance à se décomprimer légèrement. D'autre part, le tracé des fentes 2 et 4 est légèrement oblique par rapport à la direction radiale. En outre, les fentes sont incurvées, ce qui présente l'avantage que l'angle entre la direction d'une fente et la direction radiale à un point quelconque le long d'une de ces fentes (angle désigné par α à la fig. 2), va en augmentant progressivement à mesure que l'on se rapproche du centre. Cependant, pour des raisons pratiques, les fentes pourront être taillées selon un tracé rectiligne. Le nombre et par conséquent l'épaisseur des lamelles n'est pas critique. Dans la forme d'exécution décrite (diamètre 30 cm) le nombre était, à la périphérie du disque, de 90. Toutefois, selon les besoins ce nombre peut être modifié. De même, l'angle optimum d'inclinaison des fentes (angle α ) dépend des cas d'application. On a constaté que dans certains cas une valeur de 20° était avantageuse, mais cette valeur n'est pas limitative. On notera encore que l'angle d'inclinaison des fentes pouvait aussi être inversé par rapport au sens de rotation, à partir de l'exemple de la fig. 1.The polishing disc shown in fig. 1 is a massive, relatively hard felt disc with a diameter of around 30 cm. The thickness of the disc is of the order of 10 mm. This
Pour la réalisation d'une opération de polissage au moyen du disque 1, ce dernier est monté de façon à être entraîné en rotation dans le sens de la flèche 7 à la fig. 1, à une vitesse telle que sous l'effet de la force centrifuge les différentes lamelles séparées par les fentes 2 et 4 sont comprimées les unes contre les autres. Ainsi, lorsqu'une pièce à polir est appliquée de façon que la force de résistance s'exerce dans le sens de la périphérie du disque, c.à.d. dans son plan, la force de résistance est relativement élevée, alors que, si la force d'application est dirigée obliquement par rapport au plan du disque, les lamelles peuvent facilement se déformer latéralement. On évite ainsi l'usure de la pièce s'il s'agit d'une pièce en un métal tendre, par exemple en or.For carrying out a polishing operation by means of the
La fig. 3 représente schématiquement un type de carrure désigné par 8 comportant deux gonds 9 dont toutes les surfaces extérieures sont arrondies à la manière d'un jonc. On a constaté que sur ce type de carrure, les arrondis , notamment dans les surfaces de raccordement entre le jonc et les gonds, pouvaient être réalisées très rapidement et facilement sans risque d'usure de la pièce lorsqu'on utilise un disque 1 entraîné à la vitesse convenable.Fig. 3 schematically represents a type of middle designated by 8 comprising two
Claims (5)
- Disk (1) of fibrous material for polishing metallic elements, notably watch-case elements, comprising thin slots (2, 9), having, over their whole length, an oblique direction relative to the radial direction, and are disposed at its periphery, characterized in that it forms a solid element made of said material and in that its periphery is cut into abutting strips separated by the thin slots, which are of varying depths so as to define the strips, whose thickness remains approximately constant as a function of the depth.
- The disk of claim 1, characterized in that the outline of the slots in slightly curved inwards, the angle relative to the radial direction becoming progressively larger as the centre is approached.
- The disk of claim 1, characterized in that the outline of the slots is rectilinear.
- The disk of claim 1, characterized in that the fibrous material is a relatively hard felt.
- Process for polishing a metallic element, notably a watch-case element, characterized in that a felt disk according to claim 1 is used, the periphery of which is cut into abutting strips separated by thin slots having, over their whole length, an oblique direction relative to the radial direction, and in that this disk is made to rotate at a sufficient speed so that, under the effect of centrifugal force, the strips are compressed against each other at the periphery of the disk.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH223986A CH666377GA3 (en) | 1986-06-03 | 1986-06-03 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0329651A1 EP0329651A1 (en) | 1989-08-30 |
EP0329651B1 true EP0329651B1 (en) | 1992-08-19 |
Family
ID=4229102
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP87904018A Expired - Lifetime EP0329651B1 (en) | 1986-06-03 | 1987-07-01 | Polishing disk of fibrous material and process for utilizing same |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0329651B1 (en) |
CH (1) | CH666377GA3 (en) |
WO (1) | WO1989000092A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020001283A1 (en) | 2020-02-28 | 2021-09-02 | Wendt Poliertechnik Gmbh & Co. Kg | Polishing tool |
DE202020000786U1 (en) | 2020-02-28 | 2021-05-31 | Wendt Poliertechnik Gmbh & Co. Kg | Polishing tool |
WO2021170298A1 (en) | 2020-02-28 | 2021-09-02 | Wendt Poliertechnik Gmbh & Co. Kg | Polishing tool |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1926812A (en) * | 1932-06-17 | 1933-09-12 | John H Mcgrady | Buffer wheel |
US2039677A (en) * | 1934-11-12 | 1936-05-05 | Chas W House & Sons | Polishing roll |
GB456985A (en) * | 1935-05-18 | 1936-11-18 | Carborundum Co | Improvements in abrasive articles |
US2146548A (en) * | 1937-02-19 | 1939-02-07 | Curtiss Wright Corp | Flexible abrasive disk |
US2680335A (en) * | 1951-12-29 | 1954-06-08 | United Cotton Products Company | Abrading device and method of making |
FR2546098B3 (en) * | 1983-05-20 | 1986-08-22 | Prigent Fernand | POLISHING WHEEL WITH FLEXIBLE SLATS |
-
1986
- 1986-06-03 CH CH223986A patent/CH666377GA3/fr unknown
-
1987
- 1987-07-01 WO PCT/CH1987/000080 patent/WO1989000092A1/en active IP Right Grant
- 1987-07-01 EP EP87904018A patent/EP0329651B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
WO1989000092A1 (en) | 1989-01-12 |
CH666377GA3 (en) | 1988-07-29 |
EP0329651A1 (en) | 1989-08-30 |
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