EP2752717A1 - Device for attachment by clamping a blank of a part to be machined - Google Patents
Device for attachment by clamping a blank of a part to be machined Download PDFInfo
- Publication number
- EP2752717A1 EP2752717A1 EP13150395.5A EP13150395A EP2752717A1 EP 2752717 A1 EP2752717 A1 EP 2752717A1 EP 13150395 A EP13150395 A EP 13150395A EP 2752717 A1 EP2752717 A1 EP 2752717A1
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- European Patent Office
- Prior art keywords
- base
- machining
- blank
- rotation
- jaw
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- 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.)
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- 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
- G04D3/0209—Components
- G04D3/0218—Jaw-plates, revolving-head nippers
Definitions
- the present invention relates to a clamping device for clamping a blank of a workpiece.
- the present invention also relates to a part blank machining machine comprising such a device.
- the present invention finally relates to a method of machining watch platinum blank.
- clamping devices of different kinds are used in order to fix the blanks to be machined.
- Most existing fasteners do not allow machining on both opposite sides of a flat or substantially flat blank without the blank being returned manually by the operator or a manipulator robot and re-attached to inside the device.
- the machining of the blanks of watch plates is done according to two main stages. First, the upper face of the blank is machined and then the lower face is machined. Between these two machining steps, the platinum blank must be loosened, returned and then tightened again inside the machining machine by means of a fixing device. During this reversal and tightening maneuver, it frequently happens that the lower face is no longer correctly positioned relative to a geometric reference that had been used during the machining of the upper face. However, this shift, even microscopic, is not acceptable since the manufacture of watch plates requires to meet particularly stringent requirements in terms of dimensional tolerances, geometric and surface states.
- a clamping device for clamping a blank of a workpiece on a base, said blank being flat or substantially flat and having a lower face, an upper face and at least one a lateral face, said base having at least one bearing surface on which the lower face of said blank rests, said device comprising at least one jaw connected to the base and movable in a direction perpendicular to said bearing surface between a loosened position , wherein the blank is movable relative to the base, and a clamped position, in which the jaw plates the blank against the bearing surface, characterized in that the jaw and the base are each provided with at least one a central opening adapted to allow the passage of a machining tool and in that the base is pivotable under the action of displacement means about an axis of rotation pa extends to the support surface so as to position themselves respectively in a first machining position, in which the machining of the upper face of the blank
- the device of the present invention allows in particular to return the platinum blank from a first position, in which its upper face can be machined, to a second position, in which its lower face can be machined, without the blank is loosened inside the device, thus maintaining the lower and upper faces in precise positioning with respect to the same geometric reference.
- the present invention also relates to a machining machine according to claims 19 to 21 and to a machining method according to claims 22 to 23.
- FIG. 1 With reference to the figure 1 , there is shown a machine for machining blanks of workpieces according to the invention.
- Machining refers to a general process which may include any kind of machining, such as grinding, milling, turning or drilling, for example, alone or in combination.
- blade is meant platelets of various shapes, preferably square or round, said platelets being flat or substantially flat. These platelets will constitute the unmachined raw support from which will be formed smaller finished parts, such as watch plates. The blank will therefore generally have a larger size than the finished piece to obtain. As explained in detail in the following description, the blank will be caused to be cut or pre-cut to the format of the finished part, once the machining process performed. This cutting or precutting step will thus allow the separation of the portion of the unmachined blank, called remaining blank, the part of the machined blank, called part, finished part or platinum in the particular case of watch parts.
- the machine tooling machine 10 comprises in particular a clamping device 11 for clamping the blank to be machined and at least one machining tool 12.
- the machine 10 can advantageously be configured to allow a displacement and a positioning according to at least three degrees of freedom of the fixing device 11 and / or the machining tool 12.
- the machine 10 and the associated fastener 11 will be described in the following paragraphs only in the configuration shown on the figure 1 in which the axis of rotation XX 'around which the rotation of the blank to be machined takes place is horizontal and the axis ZZ' along which the displacement of the machining tool 12 is carried out is vertical.
- the machining of the upper and lower faces of the blank could be done simply by combining the movement of the blank in a horizontal plane and the movement of the machining tool along the axis ZZ '.
- This fixing device 11 is formed of two main parts: a base 21 and a jaw 22 between which is disposed the blank E to be machined.
- the base 21 is pivotally connected to left vertical support members 32 and right 33 respectively at its left ends 21a and right 21d, said support members 32 and 33 being spaced in the axial direction XX 'and being fixed to or secured to a base 31.
- the base 31 may in particular be circular and advantageously be provided with a central cavity within which will be positioned in a sliding manner a recovery system 40 provided with a recovery matrix 41, said matrix being able to hold the blank E in position during the operation of trimming the part as described below.
- the base 21 may in particular pivot about the axis XX 'under the action of an actuator (not shown) acting on a rotary shaft (not shown) received inside an end housing 23a formed in the inside of the end 21a, said shaft being axially aligned with a ball 34c fixed, for example by gluing, to the side wall of the right support member 33 which faces the left support member 32, said ball 34c being disposed partially protruding from said side wall so as to be housed at least partially within a conical cavity 23k formed inside the end 21d.
- the ball 34c will in particular have a diameter of a few mm, and preferably 4 mm.
- the base 21 is provided with a central opening 21e, substantially circular, adapted to allow the passage of the machining tool 12 during machining of the underside of the blank E.
- shape of the opening 21st may vary depending on the shape of the piece to get.
- the opening 21 is advantageously square.
- the peripheral zone of the central portion 21c surrounding the central opening 21e defines a bearing surface S on which rests the lower face of the blank E during its machining.
- said peripheral zone is advantageously provided with three point regions S1, S2 and S3 formed in projection, said point zones being preferably arranged so as to define an equilateral triangle.
- each of the zones S1, S2 and S3 will advantageously be covered with a surface coating of the PVD type, for example, increasing the coefficient of friction between the base 21 and the blank E.
- the base 21 may pivot about the axis XX in order to be positioned in at least two different machining positions, and preferably at least three different machining positions, namely a first machining position, shown in the drawings.
- FIG. Figure 6c in which the lateral face FI of the blank E can be machined by the machining tool 12 through a lateral opening 23e defined between the base 21 and the jaw 22.
- the machining of the side face allows in particular to form the hole receiving the stem of the winding watch.
- the base 21 has rotated 180 ° about the axis XX 'and that, during the displacement from the base 21 of its second machining position to its third machining position, the base 21 has rotated 90 ° in the opposite direction of clockwise.
- These specific angles of rotation are advantageously chosen so as to position the axis ZZ 'defined by the machining tool 12 perpendicular to the face to be machined.
- other specific angles of rotation different from 180 ° and 90 °, may be considered.
- the fixing device 11 will preferably comprise indexing means integrated into at least one of the vertical support members 32 or 33.
- these indexing means consist of two balls 34a aligned in a horizontal plane and two balls 34b aligned in a vertical plane, said balls 34a, 34b being fixed, for example by gluing, to the left support member 32 in such a way forming two hemispherical projections on the side wall 32a of the left support member 32 directed towards the right support member 33, said balls 34a, 34b being housed at least partially inside housings 23i and 23j formed in the side wall left of the base 21 which is disposed adjacent to the side wall 32a when the base 21 is in its first and second machining positions, with respect to the balls 34a, and in its third machining position, in which concerns the balls 34b.
- the number of indexing balls, as well as the number of corresponding housings, used to define a given machining position may also be limited to one or more than two, and that the indexing balls, and the corresponding housing used to define the first and second machining positions may also be different.
- the base 21 is provided with a first recess-shaped housing 23i and a second V-shaped slot 23j, said housings 23i and 23j being arranged substantially symmetrically by compared to the XX 'axis.
- the housings 23i, 23j provide an isostatic connection between the base 21 and the vertical support elements 32 and 33.
- the V-shaped groove can facilitate the unlocking of the base 21 when is positioned in one of its machining positions.
- the housings 23i and 23j may be identical and formed either conical cavities or V-shaped grooves.
- the fixing device 11 will preferably comprise locking means, and respectively unlocking, able to maintain the or the indexing balls 34a, 34b partially inside the housings 23i, 23j, or respectively able to position the indexing ball or balls 34a, 34b outside the housings 23i, 23j.
- the locking means consist of a pneumatic piston 35 able to apply an axial force directed to the left on an upper part 33a of the right support member 33. This piston 35 may, however, be replaced by any other actuator capable of applying a force axial directed to the left on the upper part 33a.
- the upper portion 33a is advantageously movable in the axial direction relative to a lower portion 33b of the support member 33 which is fixed on the base 31 so as to press the base 21, integral in translation with said upper portion 33a by the intermediate ball 34c, against the left support member 32, plating thus the balls 34a, 34b inside their respective housing 23i, 23j.
- this mobility of the upper part 33a can be obtained in particular by connecting said upper portion 33a to said lower portion 33b by means of two leaf springs 33c parallel and substantially vertical.
- the upper part 33a can move axially around the equilibrium position represented on the figure 2 wherein the top 33a and bottom 33b are substantially aligned in the vertical direction.
- two solutions can be envisaged.
- the unlocking is performed in part by means of the first actuator, mentioned above, which serves to rotate the base 21.
- the first actuator which serves to rotate the base 21.
- the first actuator which serves to rotate the base 21.
- This operation is facilitated if at least one of the housings is a V groove because the inclination of the edges of the groove facilitates the movement of the base 21 to the right. It is clear that such an operation is possible only if the piston 35 applies no axial force to the left on the upper part 33a.
- a second actuator is used to move the pedestal 21 in the axial direction relative to the left support element 32 so as to move it away from said left support element 32.
- This operation thus makes it possible to position the balls 34a, 34b outside their respective housing 23i, 23j.
- the base 21 is pivoted by the first actuator to the desired machining position. As in the previous solution, this operation is only feasible if the piston 35 applies no axial force to the left on the upper part 33a.
- the first and second actuators are stopped, which allows the balls 34a, 34b to be positioned in their respective housing 23i, 23j and the cylinder 35 then applies an axial force to the left on the upper part 33a so as to lock the base 21 in the desired machining position.
- the jaw 22 has a peripheral rim surrounding the central opening 22e, said rim defining at least one left peripheral rim 22b and a right peripheral rim 22d, which are disposed vertically respectively of an intermediate portion 21b of the base 21, separating the end portion 21a of the central portion 21c, and the end portion 21d.
- Said peripheral rims 22b and 22d will advantageously be disposed on either side of a central portion 22c separated vertically from the central portion 21c by the lateral opening 23e.
- a bearing surface S 'defined by the bottom wall of the central portion 22c presses on the upper face Fs of the blank E, thus pressing the lower face Fi of said blank E against the bearing surface S.
- This therefore makes it possible to maintain the blank E in a fixed position relative to the base 21.
- the bearing surface S ' is no longer supported on the upper face Fs.
- the blank E can thus freely move in the direction ZZ 'perpendicular to the bearing surface S with respect to the base 21. In this loose position, it is therefore possible to remove the blank E from the fastener 11.
- the transition from the tight position to the loosened position of the jaw 22, or vice versa, is obtained in the configuration represented by pneumatic means.
- the jaw 22 is slidably connected to the base 21 by means of a plurality of connecting elements 24, preferably by four connecting elements 24, arranged projecting on the lower face of the jaw 22, preferably at the its peripheral flanges 22b and 22d, each of said connecting elements 24 being able to slide inside a bore 21f formed in the base 21, preferably at its intermediate portion 21b or 21d end, between a low position, shown on the figure 5a , in which the connecting element 24 abuts against a shoulder 21g of the base 21, and a high position, represented on the figure 5b in which the connecting element 24 is slightly upwards in the direction ZZ 'with respect to its low position.
- the shoulder 21g may in particular be defined by the upper face of a lower portion 211 of the base 21 fixed on an upper portion 212 of said base 21, within which the connection elements 24 slide, said lower portion 211 adjacent to said upper part 212 at the open end of the bore 21f.
- Each of the connecting elements 24 is advantageously formed of an upper cylindrical portion 24a fixed to the jaw 22, by means of a screw 25 for example, and of a lower cylindrical portion 24b having an enlarged diameter with respect to said cylindrical portion upper 24a so as to define a flange 24c against which bears a lower end washer of a stack 27 of spring washers housed in the bore 21f between the bottom 21f 1 of the bore 21f and said lower cylindrical portion 24b.
- An upper end washer of the stack 27 can bear directly on the bottom 21f 1 of the bore 21f or, in the configuration shown, by means of a washer 26, said washer 26 for adjusting the force axial axis ZZ 'exerted by the stack 27.
- the stack27 will therefore be advantageously configured to elastically hold the connecting element 24 in its lower position, corresponding to the tight position of the jaw 22.
- the open end of the 21f bore opens into a cavity 21 h formed inside the lower portion 211 of the base 21, said cavity 21 h being in fluid connection with a pressurized fluid supply system adapted to vary the amount of fluid under pressure delivered.
- This pressure can be controlled so as to cause the connecting element 24 to move from its low position to its high position, thereby positioning the jaw 22 in its loosened position.
- the pressure to be applied in the chamber to cause such a displacement may in particular be equal to 5 bar.
- the fixing device 11 described above may advantageously be used in the machine tool 10.
- This machine 10 will in particular be able to machine blanks of watch plates.
- a recovery system 40 provided with an exchangeable recovery matrix 41.
- this system of recovery 40 may advantageously be positioned inside the base 31 so that the die 41 is substantially aligned with the openings 21e of the base 21 and 22e of the jaw 22 in the first and second positions of machining of the base 21.
- the recovery system 40 will in particular be configured to allow the rise of the recovery matrix 41 in a direction perpendicular to the support surface S, that is to say in the direction ZZ ', since the low position shown on the figure 6a , in which the matrix 41 is flush with the upper surface of the base 31, to a high position (not shown), in which it bears under the platinum blank E when the base 21 is in its first or second machining position.
- This rise of the die 41 may in particular occur at the end of the machining process, when only the clipping of the plate remains to be performed. Indeed, in its high position, the recovery matrix 41 will firmly maintain the platinum blank E, thus facilitating the clipping of the plate, and prevent the platen from falling on the ground once the clipping performed.
- the matrix 41 it will be advantageous to configure the matrix 41 so that it is a negative counter-form of the upper or lower face of the plate if it must be in contact with said upper face, or respectively lower.
- the holding in position of the plate on the matrix 41 will be ensured by the machining of the matrix 41.
- Another possible solution possibly complementary to the previous one, could also consist in connecting the die 41 to vacuum or suction means so as to press the plate against the die 41 by suction.
- the recovery system 40 could lower the die 41 in its lower position so as to facilitate the unloading of the plate. It is clear that such a recovery system 40 would not be useful if the format of the part or platinum to be obtained was identical to that of the blank E. In this case, the unloading of the part or the plate could be done directly after machining, the machined part still resting on the bearing surface S and the jaw 22 being in its loosened position.
- This recovery system 40 comprises in particular an upper platform 401, substantially cylindrical, sliding inside a central cavity 311 formed inside the base 31.
- This platform 401 is fixed in its lower part to a plate 402 on the upper surface of which three indexing balls 403 have been fixed, said balls being arranged so as to form an equilateral triangle.
- the recovery matrix 41 is fixed by clipping to the upper part of the platform 401.
- the platform 401 integral with the plate 402 can move along the axis ZZ 'under the action of a pneumatic piston (Not shown) whose rod 404 is fixed on the plate 402, preferably by screwing its upper end inside a threaded hole formed inside the plate.
- the recovery system 40 can vertically move the recovery matrix 41 between a low position, in which said die 41 is in contact with the base 31, and a high position, as shown in FIGS. figures 7 and 8 , in which each of indexing balls 403 abuts against a pair of cylindrical pins 405 housed inside a recess 312 formed inside the lower surface of the base 31.
- the pins 405 of each of the pairs will advantageously be arranged adjacent, the pins having the same radial orientation directed towards the ZZ 'axis.
- the pins 405 will define a housing for the indexing balls 405, said housing being substantially defined by the arcuate surfaces of the pins 405.
- the balls 403 when the recovery matrix 41 is in the high position, the balls 403 will be stalled inside their respective homes. In this position, any rotation of the platform 401, and therefore the recovery matrix 41, about the axis ZZ 'will be prevented. Moreover, so as to further improve the plating of the machined part on the recovery matrix 41, it will also be advantageous to equip the recovery system 40 with a suction device (not shown).
- the platform 401, the plate 402 and the rod 404 are preferably traversed by a fluid circulation channel 406a, 406b and 406c respectively, said channels being in fluid communication with a fluid outlet (not shown).
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Abstract
Description
La présente invention concerne un dispositif de fixation par serrage d'une ébauche de pièce à usiner.The present invention relates to a clamping device for clamping a blank of a workpiece.
La présente invention concerne également une machine d'usinage d'ébauche de pièce comprenant un tel dispositif.The present invention also relates to a part blank machining machine comprising such a device.
La présente invention concerne finalement un procédé d'usinage d'ébauche de platine horlogère.The present invention finally relates to a method of machining watch platinum blank.
Dans les machines d'usinage de pièces, notamment de platines horlogères, on utilise des dispositifs de fixation par serrage de différentes sortes afin de fixer les ébauches à usiner. La plupart des dispositifs de fixation existants ne permettent pas d'effectuer un usinage sur les deux faces opposées d'une ébauche plate ou sensiblement plate sans que ladite ébauche ne soit retournée manuellement par l'opérateur ou par un robot manipulateur et refixée à nouveau à l'intérieur du dispositif.In part machining machines, in particular watch plates, clamping devices of different kinds are used in order to fix the blanks to be machined. Most existing fasteners do not allow machining on both opposite sides of a flat or substantially flat blank without the blank being returned manually by the operator or a manipulator robot and re-attached to inside the device.
Ainsi, actuellement, l'usinage des ébauches de platines horlogères se fait selon deux étapes principales. D'abord, la face supérieure de l'ébauche est usinée et ensuite, la face inférieure est usinée. Entre ces deux étapes d'usinage, l'ébauche de platine doit être desserrée, retournée puis resserrée à nouveau à l'intérieur de la machine d'usinage au moyen d'un dispositif de fixation. Durant cette manoeuvre de retournement et de resserrage, il arrive fréquemment que la face inférieure ne soit plus correctement positionnée par rapport un référentiel géométrique qui avait servi lors de l'usinage de la face supérieure. Or, ce décalage, même microscopique, n'est pas acceptable étant donné que la fabrication de platines horlogères nécessite de respecter des exigences particulièrement sévères en terme de tolérances dimensionnelles, géométriques et d'états de surface. En particulier, la plupart des usinages réalisés sur les deux faces d'une platine horlogère doivent être parfaitement alignés pour éviter que la platine ne soit jugée comme non-conforme et ne soit mise au rebus. Pour corriger ce décalage, on est donc obligé actuellement de repositionner l'ébauche de platine à l'intérieur du dispositif de fixation, au moyen de goupilles par exemple, avant d'effectuer l'usinage de la face inférieure. Ceci limite donc fortement la productivité du procédé d'usinage dans son ensemble. Par ailleurs, ceci ne permet pas toujours d'obtenir la perfection recherchée.Thus, at present, the machining of the blanks of watch plates is done according to two main stages. First, the upper face of the blank is machined and then the lower face is machined. Between these two machining steps, the platinum blank must be loosened, returned and then tightened again inside the machining machine by means of a fixing device. During this reversal and tightening maneuver, it frequently happens that the lower face is no longer correctly positioned relative to a geometric reference that had been used during the machining of the upper face. However, this shift, even microscopic, is not acceptable since the manufacture of watch plates requires to meet particularly stringent requirements in terms of dimensional tolerances, geometric and surface states. In particular, most of the machining operations performed on both sides of a watch plate must be perfectly aligned to prevent the platen from being judged to be non-compliant and to be rejected. To correct this shift, it is therefore currently required to reposition the platinum blank inside the fixing device, by means of pins, for example, before performing the machining of the underside. This therefore greatly limits the productivity of the machining process as a whole. Moreover, this does not always achieve the desired perfection.
La présente invention vise donc à fournir une solution simple et efficace au problème susmentionné.
A cet effet, conformément à l'invention, il est proposé un dispositif de fixation par serrage d'une ébauche de pièce à usiner sur un socle, ladite ébauche étant plate ou sensiblement plate et possédant une face inférieure, une face supérieure et au moins une face latérale, ledit socle possédant au moins une surface d'appui sur laquelle repose la face inférieure de ladite ébauche, ledit dispositif comportant au moins une mâchoire reliée au socle et mobile selon une direction perpendiculaire à ladite surface d'appui entre une position desserrée, dans laquelle l'ébauche peut se déplacer par rapport au socle, et une position serrée, dans laquelle la mâchoire plaque l'ébauche contre la surface d'appui, caractérisé en ce que la mâchoire et le socle sont munis chacun d'au moins une ouverture centrale adaptée pour permettre le passage d'un outil d'usinage et en ce que le socle est apte à pivoter sous l'action de moyens de déplacement autour d'un axe de rotation parallèle à la surface d'appui de manière à se positionner respectivement selon une première position d'usinage, dans laquelle l'usinage de la face supérieure de l'ébauche peut être effectué à travers l'ouverture centrale de la mâchoire, et une seconde position d'usinage, dans laquelle l'usinage de la face inférieure de l'ébauche peut être effectué à travers l'ouverture centrale du socle.
D'autres configurations possibles de l'invention sont définies dans les revendications 2 à 18.The present invention therefore aims to provide a simple and effective solution to the problem mentioned above.
For this purpose, according to the invention, there is provided a clamping device for clamping a blank of a workpiece on a base, said blank being flat or substantially flat and having a lower face, an upper face and at least one a lateral face, said base having at least one bearing surface on which the lower face of said blank rests, said device comprising at least one jaw connected to the base and movable in a direction perpendicular to said bearing surface between a loosened position , wherein the blank is movable relative to the base, and a clamped position, in which the jaw plates the blank against the bearing surface, characterized in that the jaw and the base are each provided with at least one a central opening adapted to allow the passage of a machining tool and in that the base is pivotable under the action of displacement means about an axis of rotation pa extends to the support surface so as to position themselves respectively in a first machining position, in which the machining of the upper face of the blank can be performed through the central opening of the jaw, and a second machining position, in which machining of the underside of the blank can be performed through the central opening of the base.
Other possible configurations of the invention are defined in claims 2 to 18.
Ainsi configurée, le dispositif de la présente invention permet notamment de retourner l'ébauche de platine depuis une première position, dans laquelle sa face supérieure peut être usinée, jusqu'à une seconde position, dans laquelle sa face inférieure peut être usinée, sans que l'ébauche ne soit desserrée à l'intérieur du dispositif, maintenant ainsi les faces inférieure et supérieure dans un positionnement précis par rapport à un même référentiel géométrique.Thus configured, the device of the present invention allows in particular to return the platinum blank from a first position, in which its upper face can be machined, to a second position, in which its lower face can be machined, without the blank is loosened inside the device, thus maintaining the lower and upper faces in precise positioning with respect to the same geometric reference.
Par ailleurs, la présente invention porte également sur une machine d'usinage selon les revendications 19 à 21 et sur un procédé d'usinage selon les revendications 22 à 23.Moreover, the present invention also relates to a machining machine according to claims 19 to 21 and to a machining method according to
D'autres avantages et caractéristiques de la présente invention seront mieux compris à la lecture d'un mode particulier de réalisation de l'invention et en référence aux dessins dans lesquels:
- la
figure 1 est une vue en perspective d'une machine d'usinage conforme à l'invention ; - la
figure 2 est une vue frontale en élévation du dispositif de fixation utilisé dans la machine d'usinage de lafigure 1 , le socle étant dans une première position d'usinage ; - la
figure 3 est une vue en coupe selon le plan AA du dispositif de fixation représenté sur lafigure 2 ; - la
figure 4 est une vue en perspective du socle et de la mâchoire du dispositif de fixation représenté sur lafigure 2 ; - la
figure 5a est une vue partielle en coupe selon le plan BB du socle et de la mâchoire représentés sur lafigure 4 , la mâchoire étant dans sa position serrée ; - la
figure 5b est une vue similaire à lafigure 5a , la mâchoire étant dans sa position desserrée ; - les
figures 6a, 6b et 6c sont des vues latérales en coupe selon le plan CC du dispositif de fixation représenté sur lafigure 2 , le socle étant respectivement dans sa première, seconde et troisième positions d'usinage ; - la
figure 7 est une vue frontale en coupe d'un système de reprise utilisable dans la machine d'usinage de lafigure 1 ; - la
figure 8 est une vue de dessous du système de reprise représenté sur lafigure 7 .
- the
figure 1 is a perspective view of a machining machine according to the invention; - the
figure 2 is a frontal elevational view of the fastening device used in the machining machine of thefigure 1 , the base being in a first machining position; - the
figure 3 is a sectional view along the plane AA of the fixing device shown in FIG.figure 2 ; - the
figure 4 is a perspective view of the base and the jaw of the fixing device shown in FIG.figure 2 ; - the
figure 5a is a partial sectional view along the plane BB of the base and the jaw represented on thefigure 4 with the jaw in its tight position; - the
figure 5b is a view similar to thefigure 5a the jaw being in its loosened position; - the
Figures 6a, 6b and 6c are side views in section along the plane CC of the fixing device shown in FIG.figure 2 , the base being respectively in its first, second and third machining positions; - the
figure 7 is a frontal sectional view of a recovery system that can be used in the machining machine of thefigure 1 ; - the
figure 8 is a bottom view of the recovery system shown on thefigure 7 .
En référence à la
Par usinage, on désigne un processus général qui peut comprendre toute sorte d'usinage, tel que le meulage, le fraisage, le tournage ou le perçage, par exemple, seul ou en combinaison. Par ébauche de pièce, on désigne des plaquettes de diverses formes, de préférence carrées ou rondes, lesdites plaquettes étant plates ou sensiblement plates. Ces plaquettes constitueront le support brut non usiné à partir duquel seront formées des pièces finies plus petites, comme par exemple des platines de montre. L'ébauche aura donc généralement une taille plus grande que la pièce finie à obtenir. Comme expliqué en détail dans la suite du descriptif, l'ébauche sera donc amenée à être découpée ou prédécoupée au format de la pièce finie, une fois le processus d'usinage effectué. Cette étape de découpe ou de prédécoupe permettra donc la séparation de la partie de l'ébauche non usinée, dénommée ébauche restante, de la partie de l'ébauche usinée, dénommée pièce, pièce finie ou platine dans le cas particulier des pièces horlogères.Machining refers to a general process which may include any kind of machining, such as grinding, milling, turning or drilling, for example, alone or in combination. By "blank" is meant platelets of various shapes, preferably square or round, said platelets being flat or substantially flat. These platelets will constitute the unmachined raw support from which will be formed smaller finished parts, such as watch plates. The blank will therefore generally have a larger size than the finished piece to obtain. As explained in detail in the following description, the blank will be caused to be cut or pre-cut to the format of the finished part, once the machining process performed. This cutting or precutting step will thus allow the separation of the portion of the unmachined blank, called remaining blank, the part of the machined blank, called part, finished part or platinum in the particular case of watch parts.
Telle que représentée, la machine d'usinage 10, de type machine-outil, comprend notamment un dispositif de fixation par serrage 11 de l'ébauche à usiner et au moins un outil d'usinage 12. La machine 10 pourra avantageusement être configurée pour permettre un déplacement et un positionnement selon au moins trois degrés de liberté du dispositif de fixation 11 et/ou de l'outil d'usinage 12. Toutefois, par souci de simplification, la machine 10 et le dispositif de fixation 11 associé ne seront décrits dans les paragraphes suivants que dans la configuration représentée sur la
En référence à la
De manière à faciliter le positionnement du socle dans les trois positions d'usinage susmentionnées, le dispositif de fixation 11 comprendra de préférence des moyens d'indexage intégrés à l'un au moins des éléments support verticaux 32 ou 33. Dans la configuration représentée sur les
Une forme avantageuse de logements utilisables dans le cadre de l'invention a été représentée sur la
De manière à améliorer encore la liaison isostatique du socle sur les éléments support verticaux, il est également avantageux, comme illustré sur la
De manière à empêcher, et respectivement permettre, le pivotement du socle par rapport à l'embase dans une des positions d'usinage susmentionnées, le dispositif de fixation 11 comprendra de préférence des moyens de verrouillage, et respectivement de déverrouillage, aptes à maintenir la ou les billes d'indexage 34a, 34b partiellement à l'intérieur des logements 23i, 23j, ou respectivement aptes à positionner la ou les billes d'indexage 34a, 34b à l'extérieur des logements 23i, 23j. Dans la configuration représentée sur la
En référence aux
Le dispositif de fixation 11 décrit précédemment pourra avantageusement être utilisé dans la machine d'usinage 10. Cette machine 10 sera notamment susceptible d'usiner des ébauches de platines horlogères. Dans ce cas, il sera envisageable d'équiper la machine 10 d'un système de reprise 40 munie d'une matrice de reprise 41 interchangeable. Tel que représenté sur les
La machine d'usinage 10 munie du dispositif de fixation 11 pourra avantageusement être utilisée lors d'un procédé plus général d'usinage d'ébauche de platine horlogère. Ce procédé comprendra notamment les étapes initiales a) à k) suivantes :
- a) placement d'une ébauche de platine sur une surface d'appui d'un socle muni d'une ouverture centrale ;
- b) serrage de l'ébauche entre le socle et une mâchoire munie d'une ouverture centrale ;
- c) rotation du socle autour d'un axe de rotation XX' parallèle à la surface d'appui de façon à positionner le socle dans une première position d'usinage ;
- d) verrouillage en rotation du socle selon l'axe de rotation XX' dans la première position d'usinage ;
- e) usinage au moyen d'un outil d'usinage de la face supérieure de l'ébauche de platine à travers l'ouverture centrale de la mâchoire ;
- f) déverrouillage en rotation du socle selon l'axe de rotation XX';
- g) rotation du socle autour de l'axe de rotation XX' de façon à positionner le socle dans une seconde position d'usinage ;
- h) verrouillage en rotation du socle selon l'axe de rotation XX' dans la seconde position d'usinage ;
- i) usinage au moyen de l'outil d'usinage de la face inférieure de l'ébauche de platine à travers l'ouverture centrale du socle ;
- j) déverrouillage en rotation du socle selon l'axe de rotation XX';
- k) répétition éventuelle des étapes c) à j).
- l) rotation du socle autour de l'axe de rotation XX' de façon à positionner le socle dans une troisième position d'usinage ;
- m) verrouillage en rotation du socle selon l'axe de rotation XX' dans la troisième position d'usinage ;
- n) usinage au moyen de l'outil d'usinage de la face latérale de l'ébauche de platine à travers une ouverture latérale formée entre le socle et la mâchoire ;
- o) déverrouillage en rotation du socle selon l'axe de rotation XX'. A la fin de l'étape o), l'ébauche E sera en principe totalement usinée.
- w) desserrage et déchargement de la platine.
- p) rotation du socle autour de l'axe de rotation XX' de façon à positionner le socle dans la première, ou respectivement la seconde, position d'usinage ;
- q) verrouillage en rotation du socle selon l'axe de rotation XX' dans la première, ou respectivement la seconde, position d'usinage ;
- r) déplacement d'une matrice de reprise au moyen d'un système de reprise de manière à la positionner en appui sous la face inférieure, ou respectivement supérieure, de l'ébauche de platine;
- s) plaquage optionnel de l'ébauche de platine sur la matrice de reprise, de préférence au moyen d'une aspiration ;
- t) détourage de la platine ;
- u) déplacement de la matrice de reprise au moyen du système de reprise de manière à la positionner dans une position de déchargement ;
- v) arrêt éventuel du plaquage de l'étape s).
- w) déchargement de la platine ;
- x) desserrage de l'ébauche restante ;
- y) déchargement de l'ébauche restante.
- a1) installation de la matrice de reprise, de préférence par clipsage, sur le système de reprise ;
- a2) montée de la matrice de reprise au moyen du système de reprise dans une position haute dans laquelle elle peut être usinée par l'outil d'usinage;
- a3) usinage au moyen de l'outil d'usinage de la matrice de reprise de façon à la configurer comme une contre-forme en négatif de la face inférieure, ou respectivement supérieure, de la platine;
- a4) descente de la matrice de reprise au moyen du système de reprise dans une position basse dans laquelle elle ne gêne pas la rotation du socle.
- a) placing a platinum blank on a bearing surface of a base provided with a central opening;
- b) clamping the blank between the base and a jaw with a central opening;
- c) rotation of the base around an axis of rotation XX 'parallel to the bearing surface so as to position the base in a first machining position;
- d) locking in rotation of the base according to the axis of rotation XX 'in the first machining position;
- e) machining by means of a machining tool of the upper face of the platinum blank through the central opening of the jaw;
- f) unlocking in rotation of the base according to the axis of rotation XX ';
- g) rotation of the base around the axis of rotation XX 'so as to position the base in a second machining position;
- h) locking in rotation of the base according to the axis of rotation XX 'in the second machining position;
- i) machining using the machining tool of the underside of the platinum blank through the central opening of the base;
- j) unlocking in rotation of the base according to the axis of rotation XX ';
- k) possible repetition of steps c) to j).
- l) rotation of the base around the axis of rotation XX 'so as to position the base in a third machining position;
- m) locking in rotation of the base according to the axis of rotation XX 'in the third machining position;
- n) machining by means of the machining tool of the lateral face of the platinum blank through a lateral opening formed between the base and the jaw;
- o) unlocking in rotation of the base according to the axis of rotation XX '. At the end of step o), the blank E will in principle be completely machined.
- w) loosening and unloading of the stage.
- p) rotation of the base around the axis of rotation XX 'so as to position the base in the first or second machining position;
- q) locking in rotation of the base according to the axis of rotation XX 'in the first, or the second, machining position;
- r) moving a recovery matrix by means of a recovery system so as to position it in support under the lower face, or respectively higher, of the platinum blank;
- s) optional plating of the platinum blank on the recovery matrix, preferably by means of suction;
- t) cutting the platen;
- u) moving the recovery matrix by means of the recovery system so as to position it in an unloading position;
- v) possible stopping of the plating of step s).
- w) unloading the platen;
- x) loosening of the remaining blank;
- y) unloading the remaining blank.
- a1) installing the recovery matrix, preferably by clipping, on the recovery system;
- a2) mounting the recovery matrix by means of the recovery system in a high position in which it can be machined by the machining tool;
- a3) machining by means of the machining tool of the recovery matrix so as to configure it as a counter-form in negative of the lower face, or respectively higher, of the plate;
- a4) descent of the recovery matrix by means of the recovery system in a low position in which it does not interfere with the rotation of the base.
En référence aux
Ce système de reprise 40 comporte notamment une plate-forme supérieure 401, sensiblement cylindrique, coulissant à l'intérieur d'une cavité centrale 311 formée à l'intérieur de l'embase 31. Cette plate-forme 401 est fixée dans sa partie basse à un plateau 402 à la surface supérieure duquel ont été fixées trois billes d'indexage 403, lesdites billes étant disposées de manière à former un triangle équilatéral. La matrice de reprise 41 est quant à elle fixée par clipsage à la partie haute de la plate-forme 401. La plate-forme 401 solidaire du plateau 402 pourra se déplacer selon l'axe ZZ' sous l'action d'un piston pneumatique (non représenté) dont la tige 404 est fixée sur le plateau 402, avantageusement par vissage de son extrémité supérieure à l'intérieur d'un trou fileté formé à l'intérieur du plateau. Ainsi, le système de reprise 40 pourra déplacer verticalement la matrice de reprise 41 entre une position basse, dans laquelle ladite matrice 41 est en contact avec l'embase 31, et une position haute, telle que représentée sur les
Claims (23)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP13150395.5A EP2752717A1 (en) | 2013-01-07 | 2013-01-07 | Device for attachment by clamping a blank of a part to be machined |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP13150395.5A EP2752717A1 (en) | 2013-01-07 | 2013-01-07 | Device for attachment by clamping a blank of a part to be machined |
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EP2752717A1 true EP2752717A1 (en) | 2014-07-09 |
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EP13150395.5A Withdrawn EP2752717A1 (en) | 2013-01-07 | 2013-01-07 | Device for attachment by clamping a blank of a part to be machined |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021110339A1 (en) | 2021-04-22 | 2022-10-27 | Chiron Group Se | Machine tool, workpiece holder, support unit and manufacturing process |
WO2022223369A1 (en) | 2021-04-22 | 2022-10-27 | Chiron Group Se | Workpiece holder, support device and machining method |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010108628A1 (en) * | 2009-03-25 | 2010-09-30 | Chiron-Werke Gmbh & Co. Kg | Fixture and method for producing at least one workpiece |
-
2013
- 2013-01-07 EP EP13150395.5A patent/EP2752717A1/en not_active Withdrawn
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010108628A1 (en) * | 2009-03-25 | 2010-09-30 | Chiron-Werke Gmbh & Co. Kg | Fixture and method for producing at least one workpiece |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102021110339A1 (en) | 2021-04-22 | 2022-10-27 | Chiron Group Se | Machine tool, workpiece holder, support unit and manufacturing process |
WO2022223367A1 (en) | 2021-04-22 | 2022-10-27 | Chiron Group Se | Machine tool, workpiece holder, supporting unit and production process |
WO2022223369A1 (en) | 2021-04-22 | 2022-10-27 | Chiron Group Se | Workpiece holder, support device and machining method |
DE102021110335A1 (en) | 2021-04-22 | 2022-10-27 | Chiron Group Se | Machine tool, workpiece holder, support unit and manufacturing process |
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