EP0359594B1 - Tool for routening polycarbonate spectacle glasses in a conventional grinding machine - Google Patents

Tool for routening polycarbonate spectacle glasses in a conventional grinding machine Download PDF

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Publication number
EP0359594B1
EP0359594B1 EP89401771A EP89401771A EP0359594B1 EP 0359594 B1 EP0359594 B1 EP 0359594B1 EP 89401771 A EP89401771 A EP 89401771A EP 89401771 A EP89401771 A EP 89401771A EP 0359594 B1 EP0359594 B1 EP 0359594B1
Authority
EP
European Patent Office
Prior art keywords
tool
tool according
groove
tooth
approximately
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
EP89401771A
Other languages
German (de)
French (fr)
Other versions
EP0359594A1 (en
Inventor
Jean-Pierre Marie Fernand Langlois
Michel Jean Marcel Lecerf
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.)
Briot International SA
Original Assignee
Briot International 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 Briot International SA filed Critical Briot International SA
Publication of EP0359594A1 publication Critical patent/EP0359594A1/en
Application granted granted Critical
Publication of EP0359594B1 publication Critical patent/EP0359594B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1906—Rotary cutting tool including holder [i.e., head] having seat for inserted tool
    • Y10T407/1908—Face or end mill
    • Y10T407/1924—Specified tool shape
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T407/00—Cutters, for shaping
    • Y10T407/19—Rotary cutting tool
    • Y10T407/1952—Having peripherally spaced teeth
    • Y10T407/1962—Specified tooth shape or spacing

Definitions

  • the present invention relates generally to the trimming of ophthalmic lenses, and it relates more particularly to a new tool specially adapted for working with polycarbonate spectacle lenses.
  • polycarbonate Due to its particularly remarkable properties of transparency and impact resistance, polycarbonate is increasingly used for the manufacture of safety glasses and even corrective lenses.
  • the object of the invention is to remedy these drawbacks by producing a tool specially adapted for working with polycarbonate and usable on a conventional grinding machine, replacing the usual grinding wheel used for working glass and turning at the same speed. that this one.
  • the subject of the invention is for this purpose a tool for working polycarbonate, adaptable to a conventional machine for grinding ophthalmic lenses, characterized in that it comprises a metal body comprising in its periphery a V-shaped groove, and at least two teeth each consisting of an insert having an identical V-shaped notch, but projecting from said groove, each tooth being preceded, in the direction of rotation of the tool, by an adjoining cavity, and in that the diameter of the tool is greater than the diameter of an ophthalmic lens, and substantially equal to that of a conventional grinding wheel for ophthalmic lenses.
  • the tool comprises from two to five of said teeth.
  • the tool according to the invention comprises a body 1 made of metal, for example steel, in the form of a disc, having on its periphery a groove 2 of V section, similar to that of a conventional grinding wheel. for ophthalmic lenses.
  • Each tooth 3 is constituted by an added plate 4 made of polycrystalline diamond or of tungsten carbide, embedded in a housing 5 in which it is fixed by brazing.
  • each plate 4 projects about 0.3 mm into the groove 2 and has a V-shaped notch 7 of identical shape to that of said groove 2.
  • the V-profile of the notch 7 of the insert 4 is raised relative to the V-profile of the groove 2 of the tool after sharpening.
  • the insert has a surface forming a fillet of approximately 6 ° and the front face of the insert 4 forms an angle of approximately 4 ° relative to the corresponding radius of the body of the tool.
  • Each tooth 3 is preceded, by considering the direction of rotation of the tool (arrow R), by a cavity or clearance 8 curved in said direction of rotation, the curvature of which is that of a circle having a radius of approximately 7 mm, having a depth of about 0.9 mm, a length of about 5 mm and a width equal to that of the plate 4.
  • the angle of the V of the groove 2 and of the plates 4 is between 110 and 130 °, its depth is between 0.7 and 1.2 mm and its width is at least 18 mm.
  • the tool according to the invention is adapted to be fixed in place of the conventional grinding wheel of a machine for grinding ophthalmic lenses, and is used to work the polycarbonate blanks with the same speed of rotation as the conventional grinding wheel.
  • the tool according to the invention thus makes it possible to use a conventional grinder by simple exchange of the grinding wheel instead of using a special machine rotating at high speed with a small diameter cutter.
  • the grinding machine does not require any significant modification. To use the tool according to the invention, it suffices to control the speed of descent of the glass on a conventional grinding wheel, using existing known means, which are not part of the invention.
  • the tool according to the invention has three teeth 3. In practice, this number cannot be less than two and can be increased to five, a number greater than five can, of course, be provided. without departing from the scope of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Description

La présente invention concerne d'une façon générale le détourage des verres ophtalmiques, et elle est plus particulièrement relative à un outil nouveau spécialement adapté pour le travail des verres de lunettes en polycarbonate.The present invention relates generally to the trimming of ophthalmic lenses, and it relates more particularly to a new tool specially adapted for working with polycarbonate spectacle lenses.

En raison de ses propriété particulièrement remarquables de transparence et de résistance aux chocs, le polycarbonate est de plus en plus utilisé pour la fabrication de verres de lunettes de sécurité et même de verres correcteurs.Due to its particularly remarkable properties of transparency and impact resistance, polycarbonate is increasingly used for the manufacture of safety glasses and even corrective lenses.

Cependant l'usinage du polycarbonate présente des difficultés car cette matière fond à une température relativement basse, telle qu'il est impossible d'utiliser les meuleuses classiques pour effectuer le détourage et tailler le biseau sur des verres en polycarbonate en raison de l'encrassement excessivement rapide des meules utilisées habituellement sur ces machines.However, the machining of polycarbonate presents difficulties because this material melts at a relatively low temperature, such that it is impossible to use conventional grinders for trimming and cutting the bevel on polycarbonate glasses due to fouling. excessively fast grinding wheels commonly used on these machines.

On a donc été conduit jusqu'à présent à effectuer ces opérations sur des machines étudiées spécialement pour le travail sur des ébauches en polycarbonate, et comportant des petites fraises, ayant un diamètre inférieur à celui des verres à tailler et tournant à grande vitesse.So far we have been led to perform these operations on machines specially designed for working on polycarbonate blanks, and comprising small cutters, having a diameter smaller than that of glasses to be cut and rotating at high speed.

Malgré que ces fraises soient le plus souvent réalisées en carbure de tungstène, leur durée de vie est très courte.Although these cutters are most often made of tungsten carbide, their lifespan is very short.

Le but de l'invention est de remédier à ces inconvénients en réalisant un outil spécialement adapté pour le travail du polycarbonate et utilisable sur une machine à meuler classique, en remplacement de la meule habituelle utilisée pour le travail du verre et tournant à la même vitesse que celle-ci.The object of the invention is to remedy these drawbacks by producing a tool specially adapted for working with polycarbonate and usable on a conventional grinding machine, replacing the usual grinding wheel used for working glass and turning at the same speed. that this one.

L'invention a pour objet à cet effet un outil pour le travail du polycarbonate, adaptable sur une machine classique à meuler les verres ophtalmiques, caractérisé en ce qu' il comprend un corps en métal comportant dans sa périphérie une rainure de section en V, et au moins deux dents constituées chacune par une plaquette rapportée comportant une échancrure identique en V, mais faisant saillie par rapport à ladite rainure, chaque dent étant précédée, dans le sens de rotation de l'outil, par une cavité contiguë, et en ce que le diamètre de l'outil est supérieur au diamètre d'un verre ophtalmique, et sensiblement égal à celui d'une meule classique pour verres ophtalmiques.The subject of the invention is for this purpose a tool for working polycarbonate, adaptable to a conventional machine for grinding ophthalmic lenses, characterized in that it comprises a metal body comprising in its periphery a V-shaped groove, and at least two teeth each consisting of an insert having an identical V-shaped notch, but projecting from said groove, each tooth being preceded, in the direction of rotation of the tool, by an adjoining cavity, and in that the diameter of the tool is greater than the diameter of an ophthalmic lens, and substantially equal to that of a conventional grinding wheel for ophthalmic lenses.

De préférence, l'outil comporte de deux à cinq desdites dents.Preferably, the tool comprises from two to five of said teeth.

La description qui va suivre, en regard des dessins annexés à titre d'exemples non limitatifs, permettra de bien comprendre comment l'invention peut être mise en pratique.

  • La figure 1 est une vue en élévation latérale d'un outil suivant l'invention.
  • La figure 2 est une vue à plus grande échelle d'une dent.
  • La figure 3 est une vue suivant la flèche F de la figure 2.
  • La figure 4 est une vue de l'outil de la figure 1, perpendiculairement à son axe.
The description which follows, with reference to the accompanying drawings by way of nonlimiting examples, will make it possible to understand clearly how the invention can be put into practice.
  • Figure 1 is a side elevational view of a tool according to the invention.
  • Figure 2 is an enlarged view of a tooth.
  • FIG. 3 is a view along arrow F in FIG. 2.
  • Figure 4 is a view of the tool of Figure 1, perpendicular to its axis.

En se référant au dessin, l'outil suivant l'invention comprend un corps 1 en métal, par exemple en acier, en forme de disque, comportant sur sa périphérie une rainure 2 de section en V, analogue à celle d'une meule classique pour verres ophtalmiques.Referring to the drawing, the tool according to the invention comprises a body 1 made of metal, for example steel, in the form of a disc, having on its periphery a groove 2 of V section, similar to that of a conventional grinding wheel. for ophthalmic lenses.

Dans cette rainure 2 font saillie plusieurs dents 3, représentées de façon plus détaillée aux figures 2 et 3.In this groove 2 several teeth 3 protrude, shown in more detail in FIGS. 2 and 3.

Chaque dent 3 est constituée par une plaquette rapportée 4 en diamant polycristallin ou en carbure de tungstène, encastrée dans un logement 5 dans lequel elle est fixée par brasage.Each tooth 3 is constituted by an added plate 4 made of polycrystalline diamond or of tungsten carbide, embedded in a housing 5 in which it is fixed by brazing.

L'arête supérieure, ou d'attaque 6 de chaque plaquette 4 fait saillie d'environ 0,3 mm dans la rainure 2 et présente une échancrure 7 en forme de V de forme identique à celle de ladite rainure 2.The upper edge, or leading edge 6 of each plate 4 projects about 0.3 mm into the groove 2 and has a V-shaped notch 7 of identical shape to that of said groove 2.

En d'autres termes le profil en V de l'échancrure 7 de la plaquette 4 est surélevé par rapport au profil en V de la rainure 2 de l'outil après affûtage.In other words, the V-profile of the notch 7 of the insert 4 is raised relative to the V-profile of the groove 2 of the tool after sharpening.

En arrière de ladite arête supérieure 6, la plaquette présente une surface formant un congé d'environ 6° et la face avant de la plaquette 4 forme un angle d'environ 4° par rapport au rayon correspondant du corps de l'outil.Behind said upper edge 6, the insert has a surface forming a fillet of approximately 6 ° and the front face of the insert 4 forms an angle of approximately 4 ° relative to the corresponding radius of the body of the tool.

Chaque dent 3 est précédée, en considérant le sens de rotation de l'outil (flèche R), par une cavité ou dégagement 8 incurvé dans ledit sens de rotation, dont la courbure est celle d'un cercle ayant un rayon d'environ 7 mm, ayant une profondeur d'environ 0,9 mm, une longueur d'environ 5 mm et une largeur égale à celle de la plaquette 4.Each tooth 3 is preceded, by considering the direction of rotation of the tool (arrow R), by a cavity or clearance 8 curved in said direction of rotation, the curvature of which is that of a circle having a radius of approximately 7 mm, having a depth of about 0.9 mm, a length of about 5 mm and a width equal to that of the plate 4.

L'angle du V de la rainure 2 et des plaquettes 4 est compris entre 110 et 130°, sa profondeur est comprise entre 0,7 et 1,2mm et sa largeur est d'au moins 18 mm.The angle of the V of the groove 2 and of the plates 4 is between 110 and 130 °, its depth is between 0.7 and 1.2 mm and its width is at least 18 mm.

L'outil suivant l'invention est adapté pour être fixé à la place de la meule classique d'une machine à meuler les verres ophtalmiques, et est utilisé pour travailler les ébauches en polycarbonate avec la même vitesse de rotation que la meule classique.The tool according to the invention is adapted to be fixed in place of the conventional grinding wheel of a machine for grinding ophthalmic lenses, and is used to work the polycarbonate blanks with the same speed of rotation as the conventional grinding wheel.

L'outil suivant l'invention permet ainsi d'utiliser une meuleuse classique par simple échange de la meule au lieu d'utiliser une machine spéciale tournant à grande vitesse avec une fraise de petit diamètre.The tool according to the invention thus makes it possible to use a conventional grinder by simple exchange of the grinding wheel instead of using a special machine rotating at high speed with a small diameter cutter.

La machine à meuler ne nécessite aucune modification importante. Il suffit, pour utiliser l'outil suivant l'invention, de commander la vitesse de descente du verre sur une meule classique, en utilisant des moyens connus existants, qui ne font pas partie de l'invention.The grinding machine does not require any significant modification. To use the tool according to the invention, it suffices to control the speed of descent of the glass on a conventional grinding wheel, using existing known means, which are not part of the invention.

Suivant l'exemple de réalisation représenté, l'outil suivant l'invention comporte trois dents 3. Dans la pratique ce nombre ne peut être inférieur à deux et peut être porté à cinq, un nombre supérieur à cinq peut, bien entendu, être prévu sans sortir du cadre de l'invention.According to the embodiment shown, the tool according to the invention has three teeth 3. In practice, this number cannot be less than two and can be increased to five, a number greater than five can, of course, be provided. without departing from the scope of the invention.

Cependant l'expérience montre qu'un nombre de dents supérieur à cinq n'apporte qu'une augmentation de prix sans aucune amélioration de rendement.However, experience shows that a number of teeth greater than five brings only a price increase without any improvement in performance.

Claims (7)

1. A tool for routing polycarbonate spectacle lenses which can be fitted to a conventional machine for grinding ophthalmic lenses, characterised in that it comprises a metal body (1) provided on its periphery with a V-shaped groove (2) and at least two teeth (3) each formed by an inserted small plate (4) having an identical V-shaped channel (7) but projecting in relation to said groove (2), each tooth (3) being preceded, in the direction of rotation of the tool, by an adjoining recess (8), and in that the diameter of the tool is greater than the diameter of an ophthalmic lens and substantially equal to that of a conventional grinding wheel for ophthalmic lenses.
2. A tool according to claim 1, characterised in that the grinding wheel (1) comprises two or more than two teeth (3) and, preferably, five teeth.
3. A tool according to claim 2, characterised in that the profile of the channel (7) of each tooth (3) is raised, as a radial projection, in relation to the profile of the groove (2) of the grinding wheel.
4. A tool according to claim 3, characterised in that the height of said projection is approximately 0.3 mm after grinding.
5. A tool according to any one of claims 1 to 4, characterised in that the angle of the V of the groove (2) and that of the small plate (4) is between 110 and 130°, its depth is between 0.7 and 1.2 mm and its width is at least 18 mm.
6. A tool according to claim 5, characterised in that the curvature of said recess (8) in the direction of rotation is that of an arc of a circle having a radius of approximately 7 mm, its length, in the same direction, is approximately 5 mm, its depth is approximately 0.9 mm and its width is substantially equal to that of the tooth (3).
7. A tool according to claim 6, characterised in that the leading edge of each tooth (3) is inclined by about 4° in relation to the corresponding radius.
EP89401771A 1988-08-31 1989-06-22 Tool for routening polycarbonate spectacle glasses in a conventional grinding machine Expired - Lifetime EP0359594B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8811404 1988-08-31
FR8811404A FR2635704B1 (en) 1988-08-31 1988-08-31 TOOL FOR TRIMMING POLYCARBONATE GLASSES ON A CLASSIC GRINDER

Publications (2)

Publication Number Publication Date
EP0359594A1 EP0359594A1 (en) 1990-03-21
EP0359594B1 true EP0359594B1 (en) 1992-03-11

Family

ID=9369623

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89401771A Expired - Lifetime EP0359594B1 (en) 1988-08-31 1989-06-22 Tool for routening polycarbonate spectacle glasses in a conventional grinding machine

Country Status (4)

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US (1) US4978254A (en)
EP (1) EP0359594B1 (en)
DE (2) DE68900969D1 (en)
FR (1) FR2635704B1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318006A (en) * 1990-07-25 1994-06-07 General Electric Company Cutting insert utilizing superabrasive compacts
US5080084A (en) * 1990-10-19 1992-01-14 Kendall Robert M Light saver peep sight for archers
US5297637A (en) * 1992-06-15 1994-03-29 Kennametal Inc. Agricultural disc blade
US5725416A (en) * 1995-12-20 1998-03-10 Russell; Jerry Apparatus and method for making and using a combined cutting/grinding wheel
DE19908037B4 (en) * 1998-08-07 2006-04-13 Tawakoli, Taghi, Prof. Dr.-Ing. Tool for material processing
US6840851B1 (en) * 2000-09-28 2005-01-11 Inland Diamond Products Company Bevel edging wheel with swarf clearance
CN102049536B (en) * 2010-12-07 2012-03-14 中硬金属切削(大连)有限公司 Vertical loading and clamping five-edge cutoff blade for rough machining

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT460669A (en) *
US2268599A (en) * 1938-04-22 1942-01-06 American Optical Corp Abrading tool
US2277696A (en) * 1939-05-27 1942-03-31 American Optical Corp Abrading tool
US2477153A (en) * 1943-12-27 1949-07-26 Anna Louise Succop Milling tool
US3831236A (en) * 1972-01-07 1974-08-27 Coburn Optical Ind Cup-shaped cutting tool having cutting teeth
BE829172A (en) * 1975-05-16 1975-09-15 GLASS FLAT SIDE CUTTING WHEEL
US4164329A (en) * 1976-12-03 1979-08-14 Lee Heydenreich Chipper roller and knives therefor
US4171926A (en) * 1978-04-21 1979-10-23 American Optical Corporation Lens cutter
DE3542258A1 (en) * 1985-11-29 1987-06-04 Howema Gmbh Wittenborn & Edel Tool for machining, preferably a cutting and abrading tool
US4685440A (en) * 1986-02-24 1987-08-11 Wheel Trueing Tool Company Rotary dressing tool

Also Published As

Publication number Publication date
FR2635704A1 (en) 1990-03-02
US4978254A (en) 1990-12-18
DE68900969D1 (en) 1992-04-16
DE359594T1 (en) 1990-09-27
FR2635704B1 (en) 1990-11-02
EP0359594A1 (en) 1990-03-21

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