Classifications

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

Definitions

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

Landscapes

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

Priority Applications (1)

Applications Claiming Priority (3)

Publications (2)

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Family Applications Before (1)

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Family Cites Families (16)

• 2011
  • 2011-03-16 EP EP11158458A patent/EP2500135A1/de not_active Withdrawn
• 2012
  • 2012-02-17 RU RU2013146017/02A patent/RU2590515C2/ru active
  • 2012-02-17 WO PCT/EP2012/052743 patent/WO2012123215A1/fr active Application Filing
  • 2012-02-17 CN CN201280013601.5A patent/CN103442847B/zh active Active
  • 2012-02-17 US US14/004,812 patent/US9914195B2/en active Active
  • 2012-02-17 EP EP12704793.4A patent/EP2686134B1/de active Active
  • 2012-02-17 JP JP2013558350A patent/JP5959544B2/ja active Active

Non-Patent Citations (1)

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