EP2752717A1 - Befestigungsvorrichtung zum Einspannen eines Werkstückrohlings, der zu bearbeiten ist - Google Patents

Befestigungsvorrichtung zum Einspannen eines Werkstückrohlings, der zu bearbeiten ist Download PDF

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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
Authority
EP
European Patent Office
Prior art keywords
base
machining
blank
rotation
jaw
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.)
Withdrawn
Application number
EP13150395.5A
Other languages
English (en)
French (fr)
Inventor
Maurice Fracheboud
Cédric Chèvre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Willemin-Macodel SA
Willemin Macodel SA
Original Assignee
Willemin-Macodel SA
Willemin Macodel SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Willemin-Macodel SA, Willemin Macodel SA filed Critical Willemin-Macodel SA
Priority to EP13150395.5A priority Critical patent/EP2752717A1/de
Publication of EP2752717A1 publication Critical patent/EP2752717A1/de
Withdrawn legal-status Critical Current

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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
    • G04D3/0209—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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Jigs For Machine Tools (AREA)
EP13150395.5A 2013-01-07 2013-01-07 Befestigungsvorrichtung zum Einspannen eines Werkstückrohlings, der zu bearbeiten ist Withdrawn EP2752717A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP13150395.5A EP2752717A1 (de) 2013-01-07 2013-01-07 Befestigungsvorrichtung zum Einspannen eines Werkstückrohlings, der zu bearbeiten ist

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Application Number Priority Date Filing Date Title
EP13150395.5A EP2752717A1 (de) 2013-01-07 2013-01-07 Befestigungsvorrichtung zum Einspannen eines Werkstückrohlings, der zu bearbeiten ist

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EP2752717A1 true EP2752717A1 (de) 2014-07-09

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EP13150395.5A Withdrawn EP2752717A1 (de) 2013-01-07 2013-01-07 Befestigungsvorrichtung zum Einspannen eines Werkstückrohlings, der zu bearbeiten ist

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022223367A1 (de) 2021-04-22 2022-10-27 Chiron Group Se Werkzeugmaschine, werkstückhalter, abstützeinheit und herstellverfahren
WO2022223369A1 (de) 2021-04-22 2022-10-27 Chiron Group Se Werkstückhalter, abstützvorrichtung und bearbeitungsverfahren

Citations (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022223367A1 (de) 2021-04-22 2022-10-27 Chiron Group Se Werkzeugmaschine, werkstückhalter, abstützeinheit und herstellverfahren
DE102021110339A1 (de) 2021-04-22 2022-10-27 Chiron Group Se Werkzeugmaschine, Werkstückhalter, Abstützeinheit und Herstellverfahren
WO2022223369A1 (de) 2021-04-22 2022-10-27 Chiron Group Se Werkstückhalter, abstützvorrichtung und bearbeitungsverfahren
DE102021110335A1 (de) 2021-04-22 2022-10-27 Chiron Group Se Werkzeugmaschine, Werkstückhalter, Abstützeinheit und Herstellverfahren

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