EP1172176B1 - Verfahren zum Verbessern der Genauigkeit des Abfasen von Brillengläsern und entsprechendes Abfasewerkzeug - Google Patents

Verfahren zum Verbessern der Genauigkeit des Abfasen von Brillengläsern und entsprechendes Abfasewerkzeug Download PDF

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Publication number
EP1172176B1
EP1172176B1 EP01401705A EP01401705A EP1172176B1 EP 1172176 B1 EP1172176 B1 EP 1172176B1 EP 01401705 A EP01401705 A EP 01401705A EP 01401705 A EP01401705 A EP 01401705A EP 1172176 B1 EP1172176 B1 EP 1172176B1
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EP
European Patent Office
Prior art keywords
bevelling
tool according
working
bevelling tool
hub
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
Application number
EP01401705A
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English (en)
French (fr)
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EP1172176A1 (de
Inventor
Michel Nauche
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.)
EssilorLuxottica SA
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Essilor International Compagnie Generale dOptique SA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/16—Bushings; Mountings
    • 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/08—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass
    • B24B9/14—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of glass of optical work, e.g. lenses, prisms

Definitions

  • the present invention relates to a method for improving accuracy chamfering operation applied to spectacle lenses and a tool for chamfering for spectacle lenses according to the preamble of claims 1 and 2.
  • a method for improving accuracy chamfering operation applied to spectacle lenses and a tool for chamfering for spectacle lenses according to the preamble of claims 1 and 2.
  • An example of such a method and tool is disclosed in the document US-A-1,666,746.
  • the overhang of a spectacle lens needed for the conformity of its contour with that desired, usually made by grinding, leads to the formation of a sharp and sharp edge on the periphery of each of its front and rear faces, with, possibly, the presence of possible burrs related to the surface treatment of these faces.
  • a determined position setpoint is applied between the chamfering tool used and the spectacle lens worked, or, more precisely, between, on the one hand, the support shaft of this tool of chamfering, and on the other hand that of the spectacle lens formed, in practice, of two pins enclosing this glass.
  • the subject of the present invention is a provision making it possible overcome this difficulty simply and effectively by a method for to improve a chamfering operation applied to a spectacle lens according to the features of claim 1 and a tool according to claim 2.
  • the means of compensation for example, within the tool itself. chamfering.
  • the means of compensation thus implemented within the chamfering tool can also reduce advantageously the inertia of it, to the benefit of the dynamics of the whole.
  • a chamfering tool comprising such means of compensation can if desired be set up on a support tree concurrently with another rigid chamfering tool, the grinder as well equipped then being the choice to be, either to ensure the faithful and rigorous respect fixed position, or to be satisfied with a certain modulation of this position command, to the benefit, according to the applications, its flexibility of use.
  • the US Patent 1,666,746 discloses a machine that simultaneously grinds two surfaces of an ophthalmic lens.
  • the working rim of the tool beveling of this machine has in its slice a groove shaped in V.
  • This working rim is mounted on a rotating shaft by means of flexible connection.
  • This machine still has means to maintain and rotate the lens in the groove of the working rim. Thanks to the shape of the throat and thanks to the flexible connection means, the frame of the grinding wheel is subjected to a twisting motion to accommodate displacements due to various lens plane changes as and when as it turns.
  • the periphery of the working rim is driven in the axial direction by the periphery of the lens being beveling so that the relative positioning of the active periphery of the rim of work is permanently maintained compared to the current periphery beveling of the lens.
  • the overall goal is to cut down by chamfer the edges that presents a spectacle lens 10 along its contour, and, for example, as shown, the front edge 11 of this spectacle lens 10, that is to say, those edges that intervene at the intersection of its front face 12 and its peripheral contour 13.
  • a chamfering tool 14 comprising, globally, a hub 15, tubular, suitable for its implementation on a support shaft 16 shown in dashed lines in the figures, and at least one working rim 18 integral in rotation with this hub 15.
  • this working rim 18 comprises an abrasive active periphery 19.
  • this active periphery 19 extends following a frustoconical facet of the working rim 18.
  • the support shaft 16 of the tool of chamfering 14 is rotatably mounted, and it is the same for the support shaft corollary ensuring the maintenance of the spectacle lens 10 to work, this tree of support being in practice conventionally constituted by two pins of support adapted to grip this spectacle lens 10.
  • compensation means that is to say means having an elastic deformation capacity, between, on the one hand, the relevant periphery of any of the elements constitute the chamfering tool 14 used and the spectacle lens 10 worked, and on the other hand, the support shaft of this same element.
  • these means of compensation occur within the chamfering tool 14.
  • this chamfering tool 14 comprises, between the active periphery 19 of its working rim 18 and its hub 15, or more precisely still, between the active periphery 19 of its working rim 18 and the inner periphery 21 of its hub 15, such compensation means.
  • the working rim 18 comprises a binder of rigid material in which are scattered abrasive grains of average diameter between 4 and 20 micrometers, these grains being in diamond, silica, boron nitride or in all other abrasive material, and the compensating means having a capacitance of elastic deformation comprise an intermediate piece 22 which, interposed, radially, between the working rim 18 and the hub 15, is it of material flexible, for example elastomer.
  • This intermediate piece 22 which, for example, and as shown, is circularly continuous, is duly secured in rotation at the hub 15 only at the working rim 18.
  • the compensation means thus used according to the invention have an elasticity corresponding to a shore hardness of between 40 and 80 ShA according to standard NF T 46052, a breaking strength of between 4 and 10 MPa and a elongation at break greater than 200% according to standard NF T 46002, and, according to standard NF T 46007C, a tear limit greater than 4 DaN / cm 2 .
  • the cutting power of the working rim 18 along the active periphery 19 is preferentially limited.
  • these abutment means 23 comprise a disk 24, which, coaxial and integral with the hub 15, extends transversely through report to this one.
  • the face 25 of the working rim 18 which, opposed to its active periphery 19, is turned towards the disk 24, is parallel to this one, and it therefore extends itself transversely with respect to the hub 15.
  • the abutment means 23 are reduced to the disk 24.
  • the tool of chamfering 14 comprises two working rims 18, 18 ' each disposed respectively on either side of the disc 24.
  • the possibility of receding the rim is favorable to the durability of the chamfering function to the extent that it allows a certain wear.
  • the rim of 18 is at least partly of flexible material and thus constitutes itself the compensation means having a deformation capacity elastic, and, for example, it is the same for the working rim 18 '.
  • the working rim 18 comprises a binder of flexible material, for example elastomer, in which are disseminated, at least on the surface, grains Abrasives of suitable material such as one of the mentioned materials above, and it is the same for the working rim 18 '.
  • the elasticity when the cutting power is reduced, the elasticity must be high by way to apply a tool / glass support force large enough to compensate for the low cutting power.
  • the machining of such a spectacle lens 10 according to a small radius of the chamfering tool 14 makes it possible to increase the stiffness of the means of compensation of it, and, on the contrary, machining according to a large radius reduces this stiffness.
  • the mechanical anchoring means 27, 28 consist of teeth, respectively 29, 30, which extend annularly in a manner regularly, and in a complementary way, between the parts in question.
  • the intermediate piece 22, 22 ' is not constituted by a continuous monoblock element, but by several distinct elements, which are here in form of radius.
  • the elasticity characteristics of these elements are chosen so that they are equivalent to those mentioned above of an element continuous monobloc.
  • the disc 24 has peripherally, beyond the working rims 18 and 18 ', a flange 31 for machining a groove on the contour peripheral 13 of the spectacle lens 10.
  • the tool 14 does not has only one working rim 18, but the active periphery 19 of this rim of work has on each side a frustoconical facet, so that the same working rim 18 allows both to perform the chamfer between the face before 12 and the peripheral contour 13 of the spectacle lens 10 and the chamfer between the peripheral contour 13 and the rear face.
  • the abutment means 23 of the tool 14 shown in FIG. 10 are not constituted by a single disk 24, but by two disks 24 located respectively on either side of the working rim 18, one of the discs 24 used for the machining of the chamfer located on the side of the front face of the glass of glasses 10 and the other disc for the chamfer located on the side of the back side.
  • the disc 24 that we see on the left in Figure 10 is integral with the hub 15 while the disc 24 that we see on the right is secured to a counter-hub with an annular part being at the end of the hub 15 and having a tubular portion housing inside the hub 15 and bearing at the end of the shaft of support 16.
  • the collar 31 for machining the groove of the peripheral contour 13 of the spectacle lens 10 is not located on a disc 24 forming part of the abutment means 23, but on the periphery of a disc 32 mounted, like the tool 14, on the support shaft 16.
  • the links made respectively by the mechanical anchoring means 27 and 28 in the embodiment of the FIGS. 6 and 7 are replaced by a connection of the same type as in the other examples illustrated, that is to say by adhesion and, conversely, the bonds by adhesion of the other illustrated exemplary embodiments are replaced by links with mechanical anchoring means of the kind of those identified 27 and 28 in FIGS. 6 and 7.
  • the intermediate piece Continuous monoblock is replaced by a piece in several distinct elements, in the form of a spoke as in the example of FIGS. 8 and 9 or in another appropriate form; and the intermediate piece into several distinct elements of the example of FIGS. 8 and 9 is replaced by a monoblock intermediate piece keep on going.
  • the disc 24 is completed peripherally by a tool grooving of the kind of flange 31 of the examples illustrated in FIGS. to 10.
  • the tool for chamfering 14 comprises two separate constituent rims, for example one with a continuous monobloc intermediate piece and the other with a piece intermediate in several elements, in order to best adapt to the work at achieve.
  • the hub of the chamfering tool could be directly formed by the inner periphery of its working rim or that of the intermediate piece possibly implemented, without being more individualized.
  • the means of compensation can equally well intervene in the assembly of the glass of glasses on his support tree.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Eyeglasses (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (20)

  1. Verfahren zum Verbessern der Präzision einer Entgratung, die bezüglich eines Brillenglases bewirkt wird, umfassend das Einführen von Kompensationsmitteln (22, 22'; 18, 18'), eine elastische Verformungsfähigkeit aufweisen zwischen, einerseits der in Frage stehenden Peripherie eines beliebigen Elementes, gebildet von dem verwendeten Entgratungswerkzeug (14) und dem behandelten Brillenglas (10), und andererseits der Stützwelle dieses Elements, dadurch gekennzeichnet, dass die Entgratung lediglich bezüglich eines Grates erfolgt, sich befindend an der Peripherie entweder der Frontfläche oder der Heckfläche des Glases, mittels einer aktiven Peripherie, die sich gemäß einer konusstumpfartigen Facette (19, 19') erstreckt, lateralwärts angeordnet an dem Entgratungswerkzeug (14).
  2. Entgratungswerkzeug für ein Brillenglas, vom Typ, umfassend eine Nabe (15), geeignet zur Anordnung an einer Stützwelle (16) und zumindest eine Arbeitsfelge (18, 18'), drehfest bezüglich der Nabe (15), sowie zwischen der aktiven Peripherie (19, 19') der Arbeitsfelge (18, 18') und der Nabe (15) Kompensationsmittel (22, 22'), eine elastische Verformungskapazität aufweisend, dadurch gekennzeichnet, dass sich eine aktive Peripherie gemäß einer konusstumpfartigen Facette (19, 19') erstreckt, lateralwärts angeordnet, und somit ausschließlichen der Entgratung des Grates dienend, der sich an der Peripherie der Frontfläche befindet oder ausschließlich des Grates, der sich an der Peripherie der hinteren oder Heckfläche des Glases befindet.
  3. Entgratungswerkzeug nach Anspruch 2, dadurch gekennzeichnet, dass die Arbeitsfelge (18, 18') aus einem steifen Material gebildet ist, wobei die Kompensationsmittel ein Zwischenteil (22, 22') umfassend, welches, zwischengelagert zwischen der Arbeitsfelge (18, 18') und der Nabe (15) aus einem weichen Material gebildet ist.
  4. Entgratungswerkzeug nach Anspruch 3, dadurch gekennzeichnet, dass zwischen der Arbeitsfelge (18, 18') und dem Zwischenteil (22, 22') mechanische Verankerungsmittel (27) vorgesehen sind.
  5. Entgratungswerkzeug nach einem der Ansprüche 3, 4, dadurch gekennzeichnet, dass zwischen dem Zwischenteil (22, 22') und der Nabe (15) mechanische Verankerungsmittel (28) vorgesehen sind.
  6. Entgratungswerkzeug nach einem der Ansprüche 4, 5, dadurch gekennzeichnet, dass die mechanischen Verankerungsmittel (27, 28) aus Verzahnungen (29, 30) gebildet sind.
  7. Entgratungswerkzeug nach Anspruch 2, dadurch gekennzeichnet, dass die Arbeitsfelge (18, 18') zumindest teilweise aus weichem oder verformbarem Material besteht und somit selbst die Kompensationsmittel ausbildet.
  8. Entgratungswerkzeug nach Anspruch 7, dadurch gekennzeichnet, dass die Arbeitsfelge (18, 18') ein Bindemittel aus weichem oder elastischem Material umfasst, in welchem zumindest oberflächlich erforderliche abrasive Mittel verteilt enthalten sind.
  9. Entgratungswerkzeug nach einem der Ansprüche 2 bis 8, dadurch gekennzeichnet, dass die Kompensationsmittel (22, 22'; 18, 18') eine Elastizität aufweisen, entsprechend einem Bruchwiderstand, enthalten zwischen 4 und 10 Mpa, sowie eine Bruchlängung von mehr als 200% entsprechend der Norm NF T 46002.
  10. Entgratungswerkzeug nach einem der Ansprüche 2 bis 9, dadurch gekennzeichnet, dass die Kompensationsmittel (22, 22'; 18, 18') eine Elastizität aufweisen, entsprechend einer Shore-Rate, enthalten zwischen 40 und 80 ShA entsprechend der Norm NF T 46052 und/oder eine Reißgrenze von oberhalb 4 DaN/cm2 entsprechend der Norm NF T 46007C.
  11. Entgratungswerkzeug nach einem der Ansprüche 2 bis 10, dadurch gekennzeichnet, dass der Arbeitsfelge (18, 18') Anlagemittel (23) zugeordnet sind, die im Ruhezustand diesbezüglich unter einem Spiel (J) vorliegen.
  12. Entgratungswerkzeug nach Anspruch 11, dadurch gekennzeichnet, dass die Anlagemittel (23), die der Arbeitsfelge (18, 18') zugeordnet sind, eine Scheibe (24) umfassen, die koaxial und verbunden mit der Nabe (15) sich transversalwärts diesbezüglich erstreckt.
  13. Entgratungswerkzeug nach Anspruch 12, dadurch gekennzeichnet, dass die Fläche (25) der Arbeitsfelge (18, 18'), die hin zu der Scheibe (24) gerichtet ist, diesbezüglich parallel ist.
  14. Entgratungswerkzeug nach einem der Ansprüche 12, 13, dadurch gekennzeichnet, dass es zwei Arbeitsfelgen (18, 18') umfasst, jeweils angeordnet beidseitig der Scheibe (24), wobei die Nabe (15) der Anordnung gemeinsam ist.
  15. Entgratungswerkzeug nach Anspruch 14, dadurch gekennzeichnet, dass die zwei Arbeitsfelgen (18, 18') aktive Peripherien (19, 19') aufweisen, deren mittlere Radien (R, R') unterschiedlich sind.
  16. Entgratungswerkzeug nach Anspruch 3, dadurch gekennzeichnet, dass das Zwischenteil (22, 22') einstückig und kontinuierlich vorgesehen ist.
  17. Entgratungswerkzeug nach Anspruch 3, dadurch gekennzeichnet, dass das Zwischenteil (22, 22') aus mehreren distinkten Elementen gebildet ist.
  18. Entgratungswerkzeug nach Anspruch 17, dadurch gekennzeichnet, dass die distinkten Elemente radiengleich sind.
  19. Entgratungswerkzeug nach einem der Ansprüche 1 bis 13 und 16 bis 18, dadurch gekennzeichnet, dass es eine Arbeitsfelge (18) umfasst, deren aktive Peripherie (19) zwei entgegengesetzte konusstumpfartige Facetten aufweist.
  20. Entgratungswerkzeug nach einem der Ansprüche 2 bis 19, dadurch gekennzeichnet, dass es zwei Scheiben umfasst, jeweils befindlich beidseitig der Arbeitsfelge.
EP01401705A 2000-07-11 2001-06-27 Verfahren zum Verbessern der Genauigkeit des Abfasen von Brillengläsern und entsprechendes Abfasewerkzeug Expired - Lifetime EP1172176B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0009046 2000-07-11
FR0009046A FR2811599B1 (fr) 2000-07-11 2000-07-11 Procede pour ameliorer la precision d'une operation de chanfreinage appliquee a un verre de lunettes, et outil de chanfreinage correspondant

Publications (2)

Publication Number Publication Date
EP1172176A1 EP1172176A1 (de) 2002-01-16
EP1172176B1 true EP1172176B1 (de) 2003-12-17

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EP01401705A Expired - Lifetime EP1172176B1 (de) 2000-07-11 2001-06-27 Verfahren zum Verbessern der Genauigkeit des Abfasen von Brillengläsern und entsprechendes Abfasewerkzeug

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US (1) US6663481B2 (de)
EP (1) EP1172176B1 (de)
JP (1) JP4885379B2 (de)
DE (1) DE60101514T2 (de)
ES (1) ES2213094T3 (de)
FR (1) FR2811599B1 (de)

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FR2838364B1 (fr) * 2002-04-12 2005-01-07 Essilor Int Procede de chanfreinage d'une lentille ophtalmique comporatnt une etape de releve sans contact
FR2885063B1 (fr) * 2005-04-29 2007-07-06 Essilor Int Procede et dispositif de travail de la peripherie d'une lentille ophtalmique de lunettes
JP5343963B2 (ja) * 2010-12-28 2013-11-13 日立工機株式会社 動力工具および先端工具
JP5442057B2 (ja) * 2012-03-12 2014-03-12 株式会社クロイツ 回転工具
EP2783794B1 (de) * 2013-03-26 2017-09-27 Reishauer AG Schleifscheibe sowie Verfahren zu ihrer Verstärkung
USD785339S1 (en) * 2014-10-23 2017-05-02 Griot's Garage, Inc. Hand applicator buffing pad
CN107717672B (zh) * 2017-09-28 2019-03-15 卓培琨 一种五金零件快速打磨装置
CN107932013B (zh) * 2017-11-16 2019-04-16 佛山市川东磁电股份有限公司 一种压力传感器拆卸装置
BR112021007485A2 (pt) * 2018-10-19 2021-07-27 Saint-Gobain Abrasives, Inc. montagem de disco de retificação

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Publication number Publication date
JP4885379B2 (ja) 2012-02-29
US20020021404A1 (en) 2002-02-21
ES2213094T3 (es) 2004-08-16
JP2002079447A (ja) 2002-03-19
EP1172176A1 (de) 2002-01-16
DE60101514T2 (de) 2004-09-23
FR2811599B1 (fr) 2003-01-17
US6663481B2 (en) 2003-12-16
DE60101514D1 (de) 2004-01-29
FR2811599A1 (fr) 2002-01-18

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